Quote:
Originally Posted by mikewads
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.  |
Backpressure = improperly designed exhaust system. Building an exhaust system is based on volume and egv. People bring up "Back pressure" because the exhaust was designed incorrecty so they use some sort of restriction to bring the velocity back up. I think there will be a number of different m3s at mfest so it will be a great time to see the performance on the different cars with different exhaust systems.