BMW M135i M235i 335i 435i N55 Downpipe with 200 Cell Hi-Flow Sports Cat - T304 Stainless Steel
Upgrade your BMW N55 engine with this high-flow 200 cell sports cat downpipe for maximum performance, quicker turbo spool and an aggressive exhaust note. This premium T304 stainless steel BMW N55 downpipe is designed for the M135i, M235i, 335i and 435i, delivering sharper throttle response, real-world power gains and reduced exhaust backpressure. If you are searching for BMW M235i N55 downpipe, BMW M135i downpipe, BMW 335i downpipe or BMW 435i downpipe with 200 cell hi-flow sports cat, this is the direct solution enthusiasts choose.
Why choose this BMW N55 200 cell sports cat downpipe
- T304 high-grade stainless steel construction for strength, durability and corrosion resistance
- Expertly TIG-welded and mandrel-bent for smooth gas flow and maximum internal diameter
- Faster turbo spool for sharper throttle response and stronger mid-range punch
- Noticeable power gains with our testing showing 10 to 15 bhp on the N55 platform
- Lower exhaust gas temperatures and reduced backpressure for improved efficiency
- Substantial weight saving versus the factory catalytic converter
- Rich, more aggressive exhaust tone while retaining a high-flow catalytic converter
- Finished in brushed stainless steel for a clean OEM-plus look
This BMW N55 downpipe with 200 cell hi-flow sports cat is the ideal upgrade for drivers who want performance and sound without going decat. It is a popular choice for M135i, M235i, 335i and 435i owners seeking a high flow catalytic converter that improves power and responsiveness while remaining MOT friendly.
Fitment - BMW N55 models
Fits all N55 engines from July 2013 onward. Will not fit the 135i pre July 2013.
- 1 Series (F20) M135i, M135i xDrive, 235 kW + 240 kW N55, built from 07/2013
- 1 Series (F21) M135i, M135i xDrive, 235 kW N55, built from 07/2013
- 2 Series (F22) M235i Coupe, 240 kW N55, built from 07/2013
- 2 Series (F23) M235i Cabriolet, 240 kW N55, built from 07/2013
- 2 Series (F87) M2, 272 kW N55, built from 07/2013
- 3 Series (F30) 335i, 335i xDrive Sedan, 225 kW + 240 kW + 250 kW N55, built from 07/2013
- 3 Series (F31) 335i, 335i xDrive Touring, 225 kW + 240 kW + 250 kW N55, built from 07/2013
- 3 Series GT (F34) 335i, 335i xDrive Gran Turismo, 225 kW + 240 kW + 250 kW N55, built from 07/2013
- 4 Series (F32) 435i, 435i xDrive Coupe, 225 kW + 250 kW N55, built from 07/2013
- 4 Series (F33) 435i, 435i xDrive Cabriolet, 225 kW + 250 kW N55, built from 07/2013
- 4 Series (F36) 435i, 435i xDrive Gran Coupe, 225 kW + 250 kW N55, built from 07/2013
Performance and sound
We have tested this BMW N55 200 cell sports cat downpipe on customer cars and in-house, consistently seeing increases of 10 to 15 bhp alongside crisper throttle response and stronger spool. Drivers report a deeper, more engaging exhaust note without excessive drone. This is the perfect high flow catalytic converter upgrade for fast road use on the M135i, M235i, 335i and 435i.
Emissions and road use
- High-flow 200 cell sports cat
- Euro 5 rated
- These should pass an MOT emissions test when fitted
If your later model is equipped with OPF or PPF, these will need coding out. You will need a tuning company to carry out the coding.
Installation and support
Professional installation is recommended. Fitment is typically straightforward, though factory exhaust tolerances can vary. For fitting and support, we offer installation at Nforcd in Warwickshire. Request a quote at Sales@nforcd.com.
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