5 Inch B58 Downpipe For Supra & BMW 3.0L - M340i, M440i, M240i, 340i, 440i, 540i, 640i, 740i, X3, X4, X5Unlock unparalleled performance with Palenon Performances 5 Inch bmw B58 Downpipe, the largest on the market For Gen1 & Gen2 BMW. Engineered for 2020+ Supra 3. 0T & 2016 present BMW models including M340i, M440i, M240i, X5 40i, Z4, 440i, 540i, 640i, and 740i, this b58 downpipe features a smooth transition from 4. 5 to 5 to 4 and ultimately to the OEM connection of 3. 15. Unlike other downpipes that quickly neck down to 3 at the flex joint, our design