View Single Post
      01-18-2013, 11:03 AM   #28
Brigadier General
cssnms's Avatar

Drives: 2011 BMW 335d
Join Date: Sep 2010
Location: Murland

iTrader: (4)

If you are going to do it, increase the diameter of the pipe slightly - it's really uncessary to go HUGE here unless you are going to increase hp substantantially, but then you would also need to increase the mid pipe diameter too since our exhaust goes from a single to double.

The primary benefits as I see them are: 1) Reduced backpressure by increasing pipe diameter and removing some of the exhaust restrictions i.e. crimps and bends 2) allows for hot exhaust gas temps to escape easier which should effectively help to reduce EGT's (although I have not done any logging to prove this, but it has been proven in other diesel applications) 3) weight savings 4) increasing the ponies a little (again I never got around to doing a dyno to substantiate this, but there is plenty of documention out there to support this, even with a dpf/cat back exhaust - search for Diesel Power mag articles).

Last edited by cssnms; 01-18-2013 at 11:35 AM.