Direct-fit high-flow downpipe for B58 engines with OPF/GPF and V-band outlet: BMW M340i G20/G21, M240i G42, 540i G30, 640i G32, 840i G14/G15/G16 and Toyota GR Supra A90/A91 (2017+).
4.5 inch diameter maximises flow and cuts back pressure
V-band flange matches OEM OPF/GPF outlet for clean fitment
Delivers measurable gains: up to 15 hp and 25 Nm on Stage 1 maps
Deeper, more responsive B58 exhaust note - louder under load, civilised at cruise
No cutting or welding; includes gasket guidance but no hardware
Engineered for fast-road and track-day use - not a show-only part.
