The less bends in the exhaust system means less restrictions and reduced back pressure.
A tight 90-degree mandrel bend on a 3 inch pipe poses about the same restriction as 7.5 feet of straight pipe.
The reported dyno numbers were very good on the RPI though.
Wouldn't it be great to see the Gintani, RPI, AA, Borla, and other exhaust systems installed on the same M3, on the same dyno, and same day.
