BMW B58 GEN 2 5" Inch Catless Decat Downpipe - M240i M340i M440i 540i 840i + MORE
£209.99
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BMW B58 GEN 2 5" Inch Catless Decat Downpipe - M240i M340i M440i 540i 840i + MORE
£209.99
SB Custom — Exhaust Downpipes · Gen 2 B58
BMW B58 Gen 2 5-Inch Catless Decat Downpipe
A high-flow 5-inch catless decat downpipe for Gen 2 B58-powered BMWs. Built for real performance gains — maximum exhaust flow, faster turbo spool, more power, and a noticeably more aggressive exhaust tone — a straight bolt-on replacement for the restrictive factory OPF/PPF unit.
5-INCHBore Size
T304 STAINLESSMaterial
CATLESS / DECATStyle
1 YEARWarranty
Key Features
- Significantly increased exhaust flow for real performance gains
- Designed for Gen 2 B58 OPF-equipped models
- High-grade stainless steel construction with hand TIG-welded joints
- Direct bolt-on replacement for the restrictive factory OPF/PPF unit
- 1 year warranty against manufacturing defects and premature failure — no quibble replacement
Compatible Vehicles
2 Series
G42 M240i xDrive (2021+)
3 Series
G20 M340i (2019+)G21 M340i Touring (2019+)
4 Series
G22 M440i Coupe (2020+)G23 M440i Convertible (2020+)G26 M440i Gran Coupe (2020+)
5 Series
G30 540i (2018+)G31 540i Touring (2018+)
6 Series
G32 640i GT (2018+)
7 Series
G11 740i (2019+)G12 740i LWB (2019+)
8 Series
G14 840i Convertible (2019+)G15 840i Coupe (2019+)G16 840i Gran Coupe (2019+)
X Series SUVs
G01 X3 M40i (2020+)G02 X4 M40i (2020+)G05 X5 xDrive40i (2019+)G06 X6 xDrive40i (2020+)G07 X7 xDrive40i (2019+)
Z Series Roadster
G29 Z4 M40i (2019+)
Other
Toyota GR Supra A90 / A91 (2019+)
Please note: This downpipe is designed for Gen 2 B58 engines. It will also fit other Gen 2 B58 engines not listed above. Please check your engine code before ordering if you're unsure which generation you have.
TIG-Welded Stainless
High-grade stainless steel, hand TIG-welded for a durable, leak-free joint.
UK Stock, Fast Delivery
Dispatched from the UK — no long waits on overseas shipping.
Secure Packaging
Reinforced packaging designed to prevent transit damage.
Dedicated UK Support
Fitment questions or issues? Our team is on hand to help.
What's in the Box
- 1 x 5-inch catless decat downpipe (Gen 2 B58)
Ready to unlock your Gen 2 B58's full potential? Real performance gains, fit and forget, backed by our 1 year warranty.
This downpipe removes the OEM catalytic converter / OPF, so exhaust emissions will no longer meet original factory standards. It's intended for off-road, track, or motorsport use — please check your local emissions and road-legality regulations before fitting to a vehicle used on public roads. Fittings and gaskets are not included.