MagnaFlow Sport Series Stainless Cat-Back Performance Exhaust System | BMW M3 (01-06) (16602)The MagnaFlow 2001 2006 BMW M3 Sport Series Cat Back Performance Exhaust System enhances your 3. 2L 2001 2006 BMW M3 with an aggressive character that is sure to help you stand out from the other BMW M3 you encounter on the street. With its 2. 25in. diameter fast flowing mandrel bent main piping that passes through 2 Straight Through mufflers before ending in a Quad Split Rear exit with 3in. Polished Welded On Double Wall Angle Cut Folded Edge tips,