Wagner BMW Toyota B58C G20 G30 G29 A90 Catless Downpipe - OPF (Inc. M340i, 540i, Z4 M40i & GR Supra)

A catless downpipe for the BMW/Toyota B58 engine (found in models like the G20 3 Series, G30 5 Series, G29 Z4, and A90 Supra) is an aftermarket component designed to replace the factory downpipe that includes a catalytic converter. By removing the catalytic converter, a catless downpipe reduces exhaust backpressure, potentially increasing engine performance through improved exhaust flow and turbo response. However, it may also result in increased exhaust emissions and louder exhaust noise, and could affect emissions compliance and warranty status.