BMW M140i B58 Downpipe with 200 Cell Hi-Flow Sports Cat and Heat Shield
Upgrade your BMW B58 with a performance downpipe that delivers real results. This BMW M140i B58 downpipe with 200 cell hi-flow sports cat and integrated heat shield is engineered for flow, sound and reliability. Precision TIG welded from T-304 high-grade stainless steel with a brushed stainless finish, it replaces the restrictive factory section straight off the turbo for faster spool, sharper throttle response, noticeable power gains and a deeper, more aggressive exhaust note.
- T-304 stainless steel construction for durability and corrosion resistance
- Precision TIG welded for strength and consistent quality
- Hi-flow 200 cell sports catalytic converter for improved exhaust flow
- Integrated heat shield to manage underbonnet temperatures
- Designed for B58 turbo engines to reduce backpressure and lower temperatures
- Brushed stainless finish for an OEM-plus look
We have installed and used this B58 sports cat downpipe at Nforcd and on customer cars. Our testing has shown gains of around 20 to 25 bhp on an otherwise standard vehicle, and 120 bhp or more on a tuned setup, alongside noticeably quicker turbo response and a stronger midrange. Customers love the sound and the performance uplift, making this one of the best BMW M140i downpipe upgrades for road and track-inspired builds.
Compatible BMW B58 models, pre-OPF
- BMW M140i
- BMW M240i
- BMW 340i
- BMW 440i
- BMW 540i
- BMW 740i
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Why choose this B58 hi-flow sports cat downpipe
- Noticeable power and torque gains with improved throttle response
- More engaging, sporty exhaust tone without excessive drone
- Lower exhaust backpressure to help the turbocharger work more efficiently
- Engineered for longevity and consistent performance
Emissions and legality
These should pass an MOT emissions test when fitted. They are road legal and Euro 5 rated.
Fitting and support
Professional installation is recommended as some exhausts can sit slightly differently and space is tight around the turbo area. For expert fitting, choose Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
Ready to unlock your BMW’s potential with a high flow B58 downpipe and 200 cell sports cat that sounds incredible and performs even better? Order your BMW M140i B58 downpipe with hi-flow sports cat and heat shield today.