Which Z4 G29 downpipe should you choose?
For a road car, the HJS Tuning ECE downpipes and the sports cat downpipe both keep a catalyst in the system. The de-cat downpipe is for off-road and competition use only and will fail an MOT emissions test, and the GPF/OPF bypass is a louder, motorsport-oriented part. Most downpipe upgrades need an ECU remap. Options for other cars are in manifolds, de-cats and sports cats.
Buying Z4 parts from Milltek Exhaust Shop
Check fitment with the reg lookup at the top of the page. We offer free UK delivery, worldwide shipping, Klarna and PayPal, and fitting at our Stoke-on-Trent workshop, handy for a downpipe job if you would rather not do it at home.