BMW M140i B58 Decat Downpipe - also fits M240i 340i 440i 540i 740i - Stainless Steel 4.5 inch Catless Turbo Downpipe
Transform your BMW B58 engine with our BMW M140i B58 decat downpipe. This 4.5 inch stainless steel catless downpipe is a direct upgrade for the B58 turbo and delivers faster spool, sharper throttle response and a deeper, more aggressive exhaust note. Precision TIG welded in-house from SS304 aircraft grade stainless steel, this BMW B58 downpipe is built for performance, reliability and maximum flow. Ideal for BMW M140i, M240i, 340i, 440i, 540i and 740i owners wanting a performance exhaust upgrade that unlocks real power gains and a thrilling sound.
- SS304 aircraft grade stainless steel - durable, corrosion resistant and heat tolerant
- 4.5 inch outlet straight from the turbo for improved flow and quicker turbo spool
- TIG welded in-house for strength, precision and a premium finish
- Mandrel bent for smooth gas flow and maximum internal diameter to maintain mid-range torque
- Lower exhaust backpressure and temperatures for improved efficiency
- Significant weight saving compared with the factory catalytic converter
- Noticeable power gains and a more aggressive B58 exhaust tone
We have fitted and used this B58 downpipe ourselves at Nforcd and customer feedback has been excellent. It fits well, sounds fantastic and delivers the performance gains B58 owners are looking for.
Proven Performance
From our testing we have seen increases of around 20 to 25 bhp when paired with suitable supporting hardware and tuning. Expect crisper throttle response, faster turbo spool and a stronger pull through the rev range. This BMW M140i downpipe is a popular upgrade for enthusiasts seeking a high flow B58 decat solution.
Fitment - B58 Engine Only
Direct fit for the following BMW models with the B58 engine, including xDrive variants:
- BMW M140i 2016+ F20 F21
- BMW M240i 2016+ F22
- BMW 340i 2016+ F30 F31
- BMW 440i 2016+ F32 F33 F36
- BMW 540i 2016+ G30
- BMW 740i 2016+ G11 G12
Note: will not fit 2018 onwards cars with PPF unless the PPF has been coded out and removed.
Installation Notes
- Professional installation recommended as OEM exhaust alignment can vary slightly
- Swap the gasket at the turbo end of the downpipe or you may experience a fuel smell in the cabin
- We recommend a lambda sensor spacer O2 spacer to help prevent the engine management light in most cases - available separately
Why Choose This BMW B58 Decat Downpipe
If you are searching for BMW M140i downpipe, M240i decat downpipe, BMW 340i downpipe, 440i downpipe, 540i downpipe, 740i downpipe, BMW B58 decat, B58 catless downpipe or BMW turbo downpipe upgrade, this is the high flow, TIG welded SS304 solution built to perform. It is designed for enthusiasts who want more power, better sound and improved turbo response from their B58 engine.
Fitting Service - Nforcd Warwickshire
Want it fitted by specialists who know these cars inside out? Nforcd offers professional installation in Warwickshire. Request a fitting quote at Sales@nforcd.com.
Warranty
Supplied with a lifetime warranty for peace of mind.
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