Unlock serious performance and sound from your BMW B58 engine with the DCE 4.5 inch Downpipe for BMW M240i G42, M340i, 540i, 640i, 840i and Toyota GR Supra A90 A91. This B58 downpipe upgrade increases exhaust flow, reduces back pressure and helps your turbo spool faster for sharper throttle response, more torque and more power. Expect a deeper, louder, more aggressive exhaust note that transforms the drive without compromising daily usability.
Why choose the DCE B58 Downpipe
- 4.5 inch enlarged downpipe for significantly improved airflow and lower back pressure
- Faster turbo spool and stronger mid-range punch; quicker recovery between gear changes
- Proven gains from the downpipe alone, typically up to 15 hp and 25 Nm
- Enhanced exhaust tone: deeper, sportier and more engaging under load
- Engineered specifically for the BMW B58 platform for a high-quality fit
We run this B58 downpipe on our own development cars and customer feedback has been excellent. If you are chasing responsive power and the signature B58 soundtrack, this DCE downpipe is the upgrade you are looking for. A must-have foundation for further tuning on the B58 and a popular choice for owners targeting Stage 1 and Stage 2 style builds.
Compatibility
- BMW 2 Series M240i xDrive 374 hp (2021+, G42)
- BMW 3 Series M340i 374 hp (2020+, G20 G21)
- BMW 5 Series 540i 340 hp (2017–2023, G30 G31)
- BMW 6 Series 640i 340 hp (2018+, G32)
- BMW 8 Series 840i 340 hp (2019+, G14 G15 G16)
- Toyota GR Supra 3.0 A90 Mk5 340 hp (2019+, J29)
- Toyota GR Supra 3.0 A91 Mk5 382 hp (2019+, J29)
Fitment notes
- This downpipe is for vehicles with OPF/GPF and V-band flange outlet type. Please check your OEM downpipe outlet before ordering.
- An additional OEM V-band gasket is required for installation. Order from your BMW or Toyota dealer, or contact us and we will supply the correct gasket.
- If you are unsure about OPF/GPF and V-band compatibility, email us for confirmation and support.
Professional fitting
While competent home installation is possible, we strongly recommend professional fitting to ensure correct sealing and alignment. Nforcd offers in-house installation at our Warwickshire facility. Request a fitted price today at Sales@nforcd.com.
What you will feel
- More urgent acceleration and improved throttle response
- Quicker spool and stronger pull through the rev range
- Sporty, aggressive B58 exhaust note that turns heads
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