BMW E46 M3 Exhaust SECTION 1 with GESI ultra high flow catalysts

Active Autowerke BMW E46 M3 Exhaust SECTION 1 with GESI ultra high flow catalysts NO PERFORMANCE TUNE NEEDED. Combine the Active Autowerke Exhaust SECTION 1 with a pair of GESI G-Sport catalysts and you have part of a winning combination for your BMW E46 M3.  Design and Concept: Why create an exhaust SECTION 1 when the USA version BMW factory SECTION 1 already comes from the factory as a straight through design with two separate pipes and resonators already built in on one side? If a performance aftermarket headers was installed, how much better could one gain against the already BMW factory SECTION 1? Solution: The Active Autowerke Exhaust SECTION 1 only comes into play if the E46 M3 already has a performance header already installed. One will experience a high smell of unburnt fuel. (due to the open exhaust w/o any catalysts) and development of a RASPY like sound of which the BMW S54 engine is notorious for with the BMW Stock Section 1 when equipped. This raspy like sound is a matte