{"id":1752,"date":"2026-10-15T10:15:15","date_gmt":"2026-10-15T08:15:15","guid":{"rendered":"https:\/\/duegengineering.com\/prodotto\/kit-aspirazione-maggiorato-filtro-aria-sportivo-ducati-monster-821\/"},"modified":"2026-10-19T09:21:30","modified_gmt":"2026-10-19T07:21:30","slug":"kit-aspirazione-maggiorato-filtro-aria-sportivo-ducati-monster-821","status":"publish","type":"product","link":"https:\/\/duegengineering.com\/en\/product\/kit-aspirazione-maggiorato-filtro-aria-sportivo-ducati-monster-821\/","title":{"rendered":"Enlarged Intake Kit with Sport Air Filter for Ducati Monster 821 \/ Dark \/ Stripe \/ Stealth (2014-2020)"},"content":{"rendered":"<p><strong>In short<\/strong><\/p>\n<ul>\n<li><strong>What it is:<\/strong> the 2G Engineering enlarged intake kit (three-hole flange with Venturi profile + closing cap) with a cylindrical dry polyester sport air filter, for Ducati Monster 821, Dark, Stripe and Stealth (2014\u20132020), all versions.<\/li>\n<li><strong>What it fixes:<\/strong> the mid-range torque dip (4,300\u20135,300 rpm) and the snatchy throttle at low revs.<\/li>\n<li><strong>Dyno-tested result:<\/strong> about +5\u20136 Nm from low revs up to 5,500 rpm and up to +4 HP in the mid-range, with the stock ECU and no remap.<\/li>\n<li><strong>Plug &amp; Play and reversible:<\/strong> fits the stock airbox with no cutting or drilling.<\/li>\n<\/ul>\n<div class=\"race-only-notice\" style=\"border: 1px solid #777; border-left: 4px solid #d32f2f; padding: 12px 16px; margin: 1em 0;\">\n<p><strong>\u26a0\ufe0f FOR RACE USE ONLY<\/strong><\/p>\n<p>This product is intended exclusively for competition use on closed circuits. It is not approved for road use: use on public roads is not permitted.<\/p>\n<\/div>\n<h2>Mid-range torque dip and snatchy throttle on the Monster 821: where they come from<\/h2>\n<p>In traffic and out of slow corners, the stock Testastretta 11\u00b0 of the Monster 821 is <strong>flat at low revs<\/strong> and has a snatchy throttle response (on-off effect): to make it run smoothly around town you have to keep it between 4,000 and 5,000 rpm. On the dyno, the stock curve shows right there a <strong>torque dip between 4,300 and 5,300 rpm<\/strong>, exactly the rev range you use most on the road.<\/p>\n<p>One of the main causes is the intake: on the stock airbox, air enters through a narrow, very restrictive inlet, designed mainly to meet homologation noise limits.<\/p>\n<h2>Why changing just the air filter is not enough<\/h2>\n<p>Many Ducati riders start by fitting a <strong>sport air filter for the Monster 821<\/strong>. The problem is that the air still has to pass through the stock inlet: if the inlet is narrow, a more permeable filter makes little difference. It's like having a marathon runner's lungs and breathing through a straw.<\/p>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" width=\"2560\" height=\"1453\" data-attachment-id=\"1774\" data-permalink=\"https:\/\/duegengineering.com\/en\/?attachment_id=1774\" data-orig-file=\"https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/confronto_original_vs_2G_intake_bianco.jpg?fit=2560%2C1453&amp;ssl=1\" data-orig-size=\"2560,1453\" data-comments-opened=\"1\" data-image-title=\"confronto_original_vs_2G_intake_bianco\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/confronto_original_vs_2G_intake_bianco.jpg?fit=1024%2C581&amp;ssl=1\" class=\"aligncenter wp-image-1774 lazyload\" data-src=\"https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/confronto_original_vs_2G_intake_bianco.jpg?resize=2560%2C1453&#038;ssl=1\" alt=\"Confronto tra imbocco originale dell'airbox e flangia di aspirazione maggiorata 2G Engineering su Ducati Monster 821, Monster 1200 e SuperSport\" data-srcset=\"https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/confronto_original_vs_2G_intake_bianco.jpg?w=2560&amp;ssl=1 2560w, https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/confronto_original_vs_2G_intake_bianco.jpg?resize=300%2C170&amp;ssl=1 300w, https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/confronto_original_vs_2G_intake_bianco.jpg?resize=1024%2C581&amp;ssl=1 1024w, https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/confronto_original_vs_2G_intake_bianco.jpg?resize=768%2C436&amp;ssl=1 768w, https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/confronto_original_vs_2G_intake_bianco.jpg?resize=1536%2C872&amp;ssl=1 1536w, https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/confronto_original_vs_2G_intake_bianco.jpg?resize=2048%2C1163&amp;ssl=1 2048w, https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/confronto_original_vs_2G_intake_bianco.jpg?resize=18%2C10&amp;ssl=1 18w, https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/confronto_original_vs_2G_intake_bianco.jpg?resize=600%2C341&amp;ssl=1 600w\" data-sizes=\"auto\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 2560px; --smush-placeholder-aspect-ratio: 2560\/1453;\" data-original-sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<h2>The solution: 2G Engineering enlarged intake kit<\/h2>\n<p>The kit replaces the stock airbox inlet with an <strong>enlarged three-hole intake flange<\/strong>, blended with a <strong>Venturi profile<\/strong> that guides the air into the engine without turbulence. The cylindrical filter mounts on the flange, closed at the bottom by a cap and secured with a long bolt. The box also includes the 2G Engineering high-flow dry polyester air filter: a complete intake system, designed to work with the stock ECU. Every kit is designed and made in Soliera (Modena), in the heart of the Motor Valley, from carbon-fiber-reinforced PPA, and comes with all the hardware you need.<\/p>\n<h2>What changes on the road<\/h2>\n<ul>\n<li><strong>Strong low end and mid-range:<\/strong> the torque dip between 4,300 and 5,300 rpm disappears and throttle response becomes progressive and predictable, with no on-off.<\/li>\n<li><strong>More torque and power without a remap:<\/strong> about +5\u20136 Nm from low revs up to 5,500 rpm and up to +4 HP in the mid-range, measured on the dyno with the stock ECU. Peak power rises only slightly (about 101 HP vs 100). No remap needed.<\/li>\n<li><strong>Intake sound:<\/strong> deeper and fuller, typical of the Testastretta.<\/li>\n<li><strong>Minimal maintenance:<\/strong> the filter is dry and needs no oil: just clean it with a blast of compressed air.<\/li>\n<\/ul>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" width=\"930\" height=\"667\" data-attachment-id=\"1751\" data-permalink=\"https:\/\/duegengineering.com\/en\/?attachment_id=1751\" data-orig-file=\"https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/dyno-monster-821.png?fit=930%2C667&amp;ssl=1\" data-orig-size=\"930,667\" data-comments-opened=\"1\" data-image-title=\"dyno monster 821\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/dyno-monster-821.png?fit=930%2C667&amp;ssl=1\" class=\"aligncenter wp-image-1751 lazyload\" data-src=\"https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/dyno-monster-821.png?resize=930%2C667&#038;ssl=1\" alt=\"Curva al banco della Ducati Monster 821 di serie a confronto con il kit aspirazione 2G Engineering\" data-srcset=\"https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/dyno-monster-821.png?w=930&amp;ssl=1 930w, https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/dyno-monster-821.png?resize=300%2C215&amp;ssl=1 300w, https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/dyno-monster-821.png?resize=768%2C551&amp;ssl=1 768w, https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/dyno-monster-821.png?resize=18%2C12&amp;ssl=1 18w, https:\/\/i0.wp.com\/duegengineering.com\/wp-content\/uploads\/2026\/10\/dyno-monster-821.png?resize=600%2C430&amp;ssl=1 600w\" data-sizes=\"auto\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 930px; --smush-placeholder-aspect-ratio: 930\/667;\" data-original-sizes=\"(max-width: 930px) 100vw, 930px\" \/><\/p>\n<p>On the dyno, a stock Monster 821 was compared with the same bike fitted with the 2G kit, with no remap: torque is higher from low revs up to 5,500 rpm and the dip in the middle of the curve is filled in, while peak power changes only slightly.<\/p>\n<h2>Which version to choose<\/h2>\n<table style=\"width: 100%; border-collapse: collapse; margin: 1em 0;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">Version<\/th>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">What's included<\/th>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">Who it's for<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #777; padding: 10px;\"><strong>Kit with 2G performance air filter<\/strong> (this page)<\/td>\n<td style=\"border: 1px solid #777; padding: 10px;\">Enlarged intake kit + 2G dry polyester filter<\/td>\n<td style=\"border: 1px solid #777; padding: 10px;\">Riders still running the stock paper filter<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #777; padding: 10px;\"><a href=\"https:\/\/duegengineering.com\/en\/product\/kit-aspirazione-maggiorato-ducati-monster-821\/\">Intake kit without filter<\/a><\/td>\n<td style=\"border: 1px solid #777; padding: 10px;\">Enlarged intake kit (filter not included)<\/td>\n<td style=\"border: 1px solid #777; padding: 10px;\">Riders who already have an OEM-size air filter<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #777; padding: 10px;\"><a href=\"https:\/\/duegengineering.com\/en\/product\/filtro-aria-sportivo-poliestere-ducati-monster-821\/\">2G sport air filter only<\/a><\/td>\n<td style=\"border: 1px solid #777; padding: 10px;\">2G dry polyester filter, washable<\/td>\n<td style=\"border: 1px solid #777; padding: 10px;\">Riders who want a lifetime filter for the stock airbox<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Compatibility<\/h2>\n<p><strong>Ducati Monster 821, Dark, Stripe and Stealth (2014\u20132020), all versions.<\/strong> It fits the stock airbox with no modifications.<\/p>\n<p>Riding a Monster 696 or 796? Check out the <a href=\"https:\/\/duegengineering.com\/en\/product\/filtro-aria-sportivo-ducati-monster-696-796\/\">intake kit for the Monster 696 \/ 796<\/a>.<\/p>\n<h2>Installation<\/h2>\n<p>Installation is <strong>Plug &amp; Play<\/strong>: the kit fits the stock airbox, nothing needs cutting or drilling, and you can return to the original setup at any time.<\/p>\n<p>Approximate fitting time: about one hour.<\/p>\n<p>\ud83d\udc49 <a href=\"https:\/\/duegengineering.com\/wp-content\/uploads\/2026\/10\/Manuale-montaggio-Monster-821.pdf\" target=\"_blank\" rel=\"noopener\"><strong>Installation manual (PDF)<\/strong><\/a><\/p>\n<h2>Technical specifications<\/h2>\n<table style=\"width: 100%; border-collapse: collapse; margin: 1em 0;\">\n<tbody>\n<tr>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left; width: 35%;\">Compatible models<\/th>\n<td style=\"border: 1px solid #777; padding: 10px;\">Ducati Monster 821, Monster 821 Dark, Monster 821 Stripe and Monster 821 Stealth, all versions<\/td>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">Years<\/th>\n<td style=\"border: 1px solid #777; padding: 10px;\">2014\u20132020<\/td>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">Material<\/th>\n<td style=\"border: 1px solid #777; padding: 10px;\">Carbon-fiber-reinforced PPA, professional 3D printing, matte finish<\/td>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">Filter included<\/th>\n<td style=\"border: 1px solid #777; padding: 10px;\">2G Engineering cylindrical dry polyester sport air filter, no oil<\/td>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">Dyno result<\/th>\n<td style=\"border: 1px solid #777; padding: 10px;\">About +5\u20136 Nm from low revs up to 5,500 rpm and up to +4 HP in the mid-range, with stock ECU<\/td>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">Remap<\/th>\n<td style=\"border: 1px solid #777; padding: 10px;\">Not required<\/td>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">Installation<\/th>\n<td style=\"border: 1px solid #777; padding: 10px;\">Plug &amp; Play on the stock airbox, reversible, no cutting or drilling<\/td>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">Package contents<\/th>\n<td style=\"border: 1px solid #777; padding: 10px;\">Enlarged intake flange with Venturi profile, closing cap, long mounting bolt, dry sport air filter, all the hardware you need<\/td>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">Filter maintenance<\/th>\n<td style=\"border: 1px solid #777; padding: 10px;\">Clean with compressed air, no oil<\/td>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">Installation time<\/th>\n<td style=\"border: 1px solid #777; padding: 10px;\">About 1 hour<\/td>\n<\/tr>\n<tr>\n<th style=\"border: 1px solid #777; padding: 10px; background: #1f1f1f; color: #ffffff; text-align: left;\">Made in<\/th>\n<td style=\"border: 1px solid #777; padding: 10px;\">Italy, Soliera (Modena)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Frequently asked questions<\/h2>\n<details style=\"border: 1px solid #ccc; border-radius: 6px; padding: 12px 16px; margin: 8px 0;\">\n<summary style=\"cursor: pointer; font-weight: bold;\">Do I need to remap the ECU?<\/summary>\n<p>No. The kit is designed to work with the stock ECU of the Monster 821: the stated results (about +5\u20136 Nm from low revs up to 5,500 rpm and up to +4 HP in the mid-range) were measured with no remap.<\/p>\n<\/details>\n<details style=\"border: 1px solid #ccc; border-radius: 6px; padding: 12px 16px; margin: 8px 0;\">\n<summary style=\"cursor: pointer; font-weight: bold;\">Is a sport air filter enough to get rid of the mid-range dip?<\/summary>\n<p>Usually not. The bottleneck is the stock intake inlet, narrow and very restrictive: a more permeable filter behind the same inlet makes little difference. The kit replaces the inlet with an enlarged flange with a Venturi profile.<\/p>\n<\/details>\n<details style=\"border: 1px solid #ccc; border-radius: 6px; padding: 12px 16px; margin: 8px 0;\">\n<summary style=\"cursor: pointer; font-weight: bold;\">Is it better to change the exhaust or the intake?<\/summary>\n<p>They do different jobs: the intake works on how much air gets into the engine, the exhaust on how the gases get out. Our kit is designed to deliver results with the stock exhaust and costs a fraction of a full exhaust system.<\/p>\n<\/details>\n<details style=\"border: 1px solid #ccc; border-radius: 6px; padding: 12px 16px; margin: 8px 0;\">\n<summary style=\"cursor: pointer; font-weight: bold;\">Does it fit every version of the Monster 821?<\/summary>\n<p>Yes: Monster 821, Dark, Stripe and Stealth from 2014 to 2020, both the first series and the 2018 facelift.<\/p>\n<\/details>\n<details style=\"border: 1px solid #ccc; border-radius: 6px; padding: 12px 16px; margin: 8px 0;\">\n<summary style=\"cursor: pointer; font-weight: bold;\">Can I put the bike back to stock?<\/summary>\n<p>Yes. Installation requires no cutting or drilling: just refit the stock parts.<\/p>\n<\/details>\n<details style=\"border: 1px solid #ccc; border-radius: 6px; padding: 12px 16px; margin: 8px 0;\">\n<summary style=\"cursor: pointer; font-weight: bold;\">How long does it take to fit?<\/summary>\n<p>About one hour, with no modifications to the bike.<\/p>\n<\/details>\n<details style=\"border: 1px solid #ccc; border-radius: 6px; padding: 12px 16px; margin: 8px 0;\">\n<summary style=\"cursor: pointer; font-weight: bold;\">How do I clean the filter?<\/summary>\n<p>The filter is dry polyester and must not be oiled: clean it with a blast of compressed air against the direction of the intake flow.<\/p>\n<\/details>\n<details style=\"border: 1px solid #ccc; border-radius: 6px; padding: 12px 16px; margin: 8px 0;\">\n<summary style=\"cursor: pointer; font-weight: bold;\">How long does shipping take?<\/summary>\n<p>All kits are in stock and ship within 24 hours, worldwide. You have 15 days from delivery to return the product if you're not happy with it.<\/p>\n<\/details>\n<p><strong>Free up your Monster 821's intake: add the kit to your cart and we'll ship it within 24 hours.<\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>Increased intake kit + sports filter for Ducati Monster 821 (2014-2020). Fills the midrange torque gap, +6 Nm without a map. Plug &amp; Play.<\/p>","protected":false},"featured_media":1771,"comment_status":"open","ping_status":"closed","template":"","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"product_brand":[688637446],"product_cat":[688637451,688637384],"product_tag":[688637412,688637445,688637410,688637411,688637413],"class_list":["post-1752","product","type-product","status-publish","has-post-thumbnail","product_brand-2g-engineering","product_cat-monster-821","product_cat-alll-product","product_tag-aspirazione","product_tag-ducati-monster","product_tag-filtro-aria","product_tag-filtro-aria-racing","product_tag-filtro-poliestere","first","instock","sale","shipping-taxable","purchasable","product-type-simple"],"jetpack_publicize_connections":[],"jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/duegengineering.com\/en\/wp-json\/wp\/v2\/product\/1752","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/duegengineering.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/duegengineering.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/duegengineering.com\/en\/wp-json\/wp\/v2\/comments?post=1752"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/duegengineering.com\/en\/wp-json\/wp\/v2\/media\/1771"}],"wp:attachment":[{"href":"https:\/\/duegengineering.com\/en\/wp-json\/wp\/v2\/media?parent=1752"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/duegengineering.com\/en\/wp-json\/wp\/v2\/product_brand?post=1752"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/duegengineering.com\/en\/wp-json\/wp\/v2\/product_cat?post=1752"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/duegengineering.com\/en\/wp-json\/wp\/v2\/product_tag?post=1752"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}