Thatīs the Hartge Quad exhaust. I have it installed on my 35i. It sounds excellent and the build quality is superb. I had it installed at the Hartge Headquarters in Beckingen and have done 2800 km since. Together with the exhaust i had the Hartge remap for the 35i engine - 380 Hp - dyno tested. This car runs like hell: 300 km/h +...enough free Autobahn space permitting!
