In short
- What it is: the 2G Engineering Hammer Intake enlarged airbox lid for Ducati Hypermotard 821, 821 SP, 939, 939 SP and Hyperstrada 821 and 939 (2013–2018). Air filter not included: use it with the filter you already have.
- What it fixes: jerking and snatchy throttle at low rpm.
- Dyno-tested result: up to +3 hp and about +6 Nm with the stock ECU, no remap required.
- Plug & Play and reversible: it fits the stock airbox with no cutting or drilling.
Low-rpm jerking on the Hypermotard 821 and 939: where it comes from
In traffic, pulling away or riding on a constant throttle below 3,000 rpm, the stock Hypermotard 821 and 939 tend to jerk at low rpm and have a snatchy, on/off throttle response. The dyno also shows a torque dip between about 4,500 and 5,700 rpm, right in the range you use most on the road.
The main cause isn't the air filter but the way air gets into the airbox: the stock lid has a very small air inlet, designed mainly to meet European noise homologation limits.
Why a performance air filter alone isn't enough
Many Ducati owners start by fitting a performance air filter for the Hypermotard 821 and 939. The problem is that the filter sits behind the same stock air inlet: if air can't get into the airbox, a freer-flowing filter changes very little. It's like having a marathon runner's lungs and breathing through a straw.
The solution: 2G Engineering Hammer Intake
The lid replaces the restrictive factory one with a smooth-flow intake duct that doubles the air inlet area. It works with the filter you already have: the stock Ducati paper filter or a performance filter with OEM dimensions. Every lid is designed and made in Soliera (Modena), in the heart of Italy's Motor Valley, from carbon-fiber-reinforced PPA.
What changes on the road
- Smooth low-rpm response: throttle response becomes progressive and predictable, with no jerks.
- More torque and power without a remap: up to +3 hp and about +6 Nm measured on the dyno with the stock ECU. No remap needed.
- Intake sound: deeper and fuller, especially from the mid-range up.
- Keep the filter you already have: it works with the stock paper filter and with the main performance filters, such as BMC, K&N, Sprint Filter and 2G Engineering.
The chart compares a stock Hypermotard 821 with the same bike fitted with the 2G kit, without a remap: with the kit, torque is higher from 2,200 rpm and the dip between 4,500 and 5,700 rpm disappears.
Which version to choose
| Version | What's included | Who it's for |
|---|---|---|
| Kit with 2G performance air filter | Enlarged airbox lid + 2G dry polyester filter | Riders still running the stock paper filter |
| Enlarged airbox lid only (this page) | Enlarged airbox lid (filter not included) | Riders who already have a filter: stock paper or OEM-size performance filter |
| Kit with Sprint Filter air filter | Enlarged airbox lid + Sprint Filter P08 | Riders who prefer a Sprint Filter |
| 2G performance air filter only | 2G dry polyester filter, washable | Riders who want a lifetime filter for the stock airbox |
Compatibility
Ducati Hypermotard 821, 821 SP, 939, 939 SP and Hyperstrada 821 and 939, all model years from 2013 to 2018. Fits the stock airbox with no modifications.
Compatible filters: stock Ducati paper filter and OEM-size performance filters (BMC, K&N, Sprint Filter, 2G Engineering).
Riding a Hypermotard 950? Check out the intake kit for the Hypermotard 950.
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.
Fitting time stated in the manual: 60–90 minutes, including fuel tank removal.
👉 Installation manual in Italian (PDF)
👉 English assembly manual (PDF)
Technical specifications
| Compatible models | Ducati Hypermotard 821, 821 SP, 939, 939 SP, Hyperstrada 821, Hyperstrada 939 |
|---|---|
| Years | 2013–2018, all model years |
| Material | Carbon-fiber-reinforced PPA, professional 3D printing, matte finish |
| Air filter | Not included. Compatible with the stock Ducati filter and OEM-size performance filters (BMC, K&N, Sprint Filter, 2G) |
| Dyno result | Up to +3 hp and about +6 Nm with stock ECU |
| Remap | Not required |
| Installation | Plug & Play on the stock airbox, reversible, no cutting or drilling |
| Fitting time | 60–90 minutes (fuel tank removal) |
| Box contents | Enlarged airbox lid, steel fixing screws, installation instructions. Air filter not included |
| Made in | Italy, Soliera (Modena) |
Frequently asked questions
Is the air filter included?
No. This version contains only the enlarged airbox lid: you use it with the filter you already have. If you also need a filter, choose the kit with the 2G performance air filter or the kit with the Sprint Filter.
Can I use it with the stock paper filter?
Yes. The lid works with the stock Ducati filter and with OEM-size performance filters.
Is it compatible with K&N filters?
Yes. On the Hypermotard 821 and 939 the filter doesn't need to be squeezed to fit the lid, so even the stiffer K&N filters fit with no problems.
Do I need to remap the ECU?
No. The lid is designed to work with the stock Hypermotard 821 and 939 ECU: the quoted gains (+3 hp and about +6 Nm) were measured without a remap.
Exhaust or intake: which should I upgrade first?
They do different jobs: the intake controls how much air gets into the engine, the exhaust 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 the SP versions and the Hyperstrada?
Yes: Hypermotard 821, 821 SP, 939, 939 SP and Hyperstrada 821 and 939, all model years from 2013 to 2018.
Can I return the bike to stock?
Yes. No cutting or drilling is needed: just refit the stock lid.
How long does it take to fit?
About 60–90 minutes: the fuel tank has to come off to reach the airbox. All the steps are in the installation manual.
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 satisfied.
Free up your Hypermotard 821 or 939's intake: add the lid to your cart and we'll ship it within 24 hours.
Gianpy –
Review of the Ducati Hypermotard 821 / 939 Racing Intake | Plug & Play Kit
★ ★ ★ ★ ★
Tiago Parro (verified owner) –
Perfect fit and finish.
Already can feel more immediacy from lower revs.