BMW 335i N54 Decat Downpipes and Stepped Front Mount Intercooler 2006-2010
Unlock the full potential of your BMW N54 with this performance package designed for the 2006-2010 BMW 335i and 135i. This kit combines high-flow stainless steel decat downpipes with a high-efficiency stepped front mount intercooler to reduce backpressure, drop intake temperatures and deliver sharper throttle response, stronger mid-range pull and a more aggressive exhaust note. Perfect for E90, E91, E92, E93 335i and E82, E88 135i owners looking for proven power gains and reliable cooling.
Stainless Steel Decat Downpipes – BMW 135i 335i N54
- T304 high-grade stainless steel construction with precision TIG welding for durability and long-term performance.
- Fabricated in the UK with laser-cut 10-12 mm flanges for a precise, leak-free fit.
- One-piece design bent on a 12-axis CNC tube bending machine for optimal gas flow and maximum internal diameter while retaining mid-range torque.
- Faster turbo spool for sharper throttle response and improved drivability.
- Noticeable power gains and a deeper, more aggressive exhaust tone.
- Lower exhaust gas temperatures and reduced backpressure by relieving the turbocharger, improving cylinder charge.
- Substantial weight saving compared to the OEM catalytic converters.
Tested gains: we have seen increases of 12-17 bhp from the downpipes alone.
We recommend adding Lambda sensor spacers O2 sensor spacers to help prevent the engine management light in most cases.
Downpipes come with a lifetime warranty.
MTC Motorsport Stepped Front Mount Intercooler – N54 135i 335i
- Bar-and-plate core paired with flowed cast end tanks for maximum cooling efficiency and minimal pressure drop.
- Massive 5 inch competition stepped core increases surface area for superior heat dissipation.
- Near 100 percent more volume and 100 percent more frontal surface area than the standard intercooler.
- Capable of supporting builds over 600 bhp while maintaining stable intake air temperatures.
- Direct-fit FMIC for E-series N54 platforms. Professional installation recommended and typically 1-2 hours.
Real-world results: in our testing, intercooler inlet temps were 135-140 degrees across five back-to-back road pulls. Outlet temps with the stock intercooler were 75-80 degrees, while the MTC stepped intercooler consistently delivered outlet temps in the high 20s over all five runs. That translates into repeatable, consistent power on the road.
Proven by us and loved by customers
We run and supply these N54 decat downpipes and the MTC stepped FMIC because they work. Our customers consistently report stronger low and mid-range response, cooler intake temps and reliable performance pull after pull. If you want one of the best-value BMW 335i N54 performance upgrades, this is it.
Fitment – BMW N54 2006-2010
- BMW 1 Series E82 E88 - 135i N54 engine 2006-2010
- BMW 3 Series E90 E91 E92 E93 - 335i N54 engine 2006-2010
Fitting and support
Professional installation is recommended, as OE exhaust alignment can vary and access can be tight. For expert fitting, choose Nforcd in Warwickshire. Request a fitting quote via Sales@nforcd.com.
Notes
- Decat downpipes are intended for off-road and track use where applicable. Check local regulations before use on public roads.
- Adding Lambda sensor spacers is recommended to help prevent the EML in most cases.
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