In short
- What it is: 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 (2014–2020), all versions.
- What it fixes: the mid-range torque dip (4,300–5,300 rpm) and the snatchy throttle at low revs.
- Dyno-tested result: about +5–6 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.
- Plug & Play and reversible: fits the stock airbox with no cutting or drilling.
⚠️ FOR RACE USE ONLY
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.
Mid-range torque dip and snatchy throttle on the Monster 821: where they come from
In traffic and out of slow corners, the stock Testastretta 11° of the Monster 821 is flat at low revs 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 torque dip between 4,300 and 5,300 rpm, exactly the rev range you use most on the road.
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.
Why changing just the air filter is not enough
Many Ducati riders start by fitting a sport air filter for the Monster 821. 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.
The solution: 2G Engineering enlarged intake kit
The kit replaces the stock airbox inlet with an enlarged three-hole intake flange, blended with a Venturi profile 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.
What changes on the road
- Strong low end and mid-range: the torque dip between 4,300 and 5,300 rpm disappears and throttle response becomes progressive and predictable, with no on-off.
- More torque and power without a remap: about +5–6 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.
- Intake sound: deeper and fuller, typical of the Testastretta.
- Minimal maintenance: the filter is dry and needs no oil: just clean it with a blast of compressed air.
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.
Which version to choose
| Version | What's included | Who it's for |
|---|---|---|
| Kit with 2G performance air filter (this page) | Enlarged intake kit + 2G dry polyester filter | Riders still running the stock paper filter |
| Intake kit without filter | Enlarged intake kit (filter not included) | Riders who already have an OEM-size air filter |
| 2G sport air filter only | 2G dry polyester filter, washable | Riders who want a lifetime filter for the stock airbox |
Compatibility
Ducati Monster 821, Dark, Stripe and Stealth (2014–2020), all versions. It fits the stock airbox with no modifications.
Riding a Monster 696 or 796? Check out the intake kit for the Monster 696 / 796.
Installation
Installation is Plug & Play: the kit fits the stock airbox, nothing needs cutting or drilling, and you can return to the original setup at any time.
Approximate fitting time: about one hour.
Technical specifications
| Compatible models | Ducati Monster 821, Monster 821 Dark, Monster 821 Stripe and Monster 821 Stealth, all versions |
|---|---|
| Years | 2014–2020 |
| Material | Carbon-fiber-reinforced PPA, professional 3D printing, matte finish |
| Filter included | 2G Engineering cylindrical dry polyester sport air filter, no oil |
| Dyno result | About +5–6 Nm from low revs up to 5,500 rpm and up to +4 HP in the mid-range, with stock ECU |
| Remap | Not required |
| Installation | Plug & Play on the stock airbox, reversible, no cutting or drilling |
| Package contents | Enlarged intake flange with Venturi profile, closing cap, long mounting bolt, dry sport air filter, all the hardware you need |
| Filter maintenance | Clean with compressed air, no oil |
| Installation time | About 1 hour |
| Made in | Italy, Soliera (Modena) |
Frequently asked questions
Do I need to remap the ECU?
No. The kit is designed to work with the stock ECU of the Monster 821: the stated results (about +5–6 Nm from low revs up to 5,500 rpm and up to +4 HP in the mid-range) were measured with no remap.
Is a sport air filter enough to get rid of the mid-range dip?
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.
Is it better to change the exhaust or the intake?
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.
Does it fit every version of the Monster 821?
Yes: Monster 821, Dark, Stripe and Stealth from 2014 to 2020, both the first series and the 2018 facelift.
Can I put the bike back to stock?
Yes. Installation requires no cutting or drilling: just refit the stock parts.
How long does it take to fit?
About one hour, with no modifications to the bike.
How do I clean the filter?
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.
How long does shipping take?
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.
Free up your Monster 821's intake: add the kit to your cart and we'll ship it within 24 hours.
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