Evolution Racewerks ER B58 4.5 inch Catless Downpipe - Competition Series - Toyota A90 GR Supra, BMW M140i M240i 340i 440i G30 540i Z4 M40i
Make your B58 engine come alive with the Evolution Racewerks Competition Series 4.5 inch Catless Downpipe. This high flow B58 downpipe is engineered for maximum exhaust flow and minimum backpressure, delivering faster turbo spool, stronger mid range torque and a harder hitting top end on Toyota GR Supra A90 and BMW B58 models. If you are searching for Supra A90 downpipe, Toyota GR Supra catless downpipe, BMW M140i downpipe, M240i downpipe, 340i downpipe, 440i downpipe, G30 540i downpipe, Z4 M40i downpipe or B58 decat downpipe, this is the proven upgrade that enthusiasts choose.
The factory catalytic converter is a major restriction on B58 platforms. ER’s true 4.5 inch design uses a precision CNC machined turbo V band flange that matches the B58 turbo outlet for a smooth, turbulence free transition. The result is lower backpressure, quicker throttle response and earlier boost. Based on ER dyno testing, gains of up to 32 whp and 16 wtq are achievable with supporting modifications. Most importantly, you feel the difference everywhere in the rev range.
Why the true 4.5 inch B58 downpipe wins
Many pipes step down at the flange which creates a lip and turbulence right at the turbine exit. The ER Competition Series keeps a genuine 4.5 inch outlet at the turbo then uses a long, smooth taper to the factory 3 inch system. That means freer flow, reduced backpressure and faster turbocharger spool on road or track.
Key features
- Direct fit bolt on for Toyota GR Supra A90 and BMW B58 platforms listed below
- True 4.5 inch CNC machined turbo V band flange for optimal flow
- Mandrel bent tubing with smooth long transitions for maximum velocity
- 100 percent 304 stainless steel construction for durability
- 100 percent TIG welded by Evolution Racewerks in house fabricators
- Factory location O2 sensor bungs, precision CNC machined
- Compatible with factory and aftermarket cat back exhausts
- Track tested durability, includes required hardware
- Brushed stainless finish
- Limited Lifetime Warranty from Evolution Racewerks
Real world performance
ER testing has shown gains of up to 32 whp and 16 wtq with supporting mods. Expect faster spool, crisper throttle response and a stronger, earlier torque curve that transforms daily driving and track sessions alike. The catless design and long tapers reduce turbulence and backpressure for a cleaner, harder pull through the entire powerband.
Compatibility - B58 applications
Toyota
- GR Supra A90 2019+
BMW 1 Series
- 2016+ F20 F21 B58 M140i and M140ix
BMW 2 Series
- 2016+ F22 F23 B58 M240i and M240ix
BMW 3 Series
- 2016+ F30 F31 F34 GT B58 340i and 340ix
BMW 4 Series
- 2016+ F32 F33 F36 B58 440i and 440ix
Also fits
- G30 540i
- G29 Z4 M40i
- X3 M40i, X4 M40i, X5 40i
Part numbers
- BM-EXH018 - BMW B58
- TO-EXH001 - Toyota A90 GR Supra
Recommended installation parts
We recommend replacing the downpipe gasket when fitting the ER 4.5 inch catless downpipe.
Fitting and support
Professional fitting is available at Nforcd in Warwickshire. We have installed this upgrade on customer cars and in our own builds with excellent results and feedback. Email Sales@nforcd.com for a quotation and booking.
Warranty
Evolution Racewerks Limited Lifetime Warranty. Non transferable.
Usage note
Catless downpipes are intended for off road or motorsport use only where permitted. Check local regulations before purchase and installation.
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