BMW 135i N55 Decat Downpipe E82 E88 2011–2012 with 200 Cell Hi-Flow Sports Cat
Upgrade your BMW N55 exhaust with a UK-made downpipe engineered for power, sound and reliability. This BMW 135i N55 downpipe fits early E-chassis cars and delivers faster turbo spool, sharper throttle response and a deeper, more aggressive exhaust note. Built from premium T304 stainless steel and TIG welded in-house, it is a proven performance upgrade for the N55 engine.
Why choose this BMW N55 downpipe
- T304 high-grade stainless steel construction, TIG welded in-house in the UK
- Laser-cut flanges 10–12 mm for a precise, leak-free seal
- Mandrel-bent for maximum internal diameter and superior gas flow
- Quicker turbo spool and noticeably sharper throttle response
- Real-world gains: we have tested this product and found increases of 12–17 bhp
- More aggressive, motorsport-inspired exhaust tone
- Reduced backpressure and lower temperatures, improving turbo efficiency
- Substantial weight saving compared to the factory catalytic converter
- Direct bolt-on fitment to OEM system for E-chassis N55
- Lifetime warranty for long-term peace of mind
Fitment
- BMW 1 Series E82 E88 – 135i N55 engine 2011–2012
- BMW 3 Series E90 E91 E92 E93 – 335i N55 engine 2011–2012
Installation and support
Professional installation is recommended as some exhaust systems sit slightly differently and can be tight. Feedback from customers has been that this downpipe is very easy to fit. For expert fitting, choose Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
O2 sensor spacer recommendation
We recommend adding Lambda Sensor Spacer(s) to help prevent the engine management light in most cases. Search our other items to find suitable O2 spacers.
Compliance
The 200 cell hi-flow sports cat should pass an MOT emissions test when fitted. They are road legal and Euro 5 rated.
Trusted by enthusiasts
We have used this product ourselves with excellent results, and customer feedback has been consistently positive on performance gains, build quality and sound.
Keywords for search
BMW 135i N55 downpipe, BMW 135i decat downpipe, BMW N55 decat, BMW N55 200 cell sports cat, BMW 135i E82 E88 downpipe 2011 2012, BMW 335i N55 downpipe E90 E91 E92 E93 2011 2012, T304 stainless steel downpipe, TIG welded downpipe UK made, high flow downpipe, catless downpipe N55, hi-flow sports cat N55, performance exhaust upgrade BMW 135i 335i, aggressive exhaust note N55, turbo spool improvement N55, throttle response N55, lifetime warranty downpipe, lambda spacer O2 spacer N55.