DirtyOil wrote:
I would NOT do the straight pipe. There are aftermarket exhaust that do as good of job letting it exhaust and sound good. A straight pipe will drive you nuts running down the road with a load. I have a MBRP exhaust on my 05 and really like it and has no droan.
Gee-buzz guys!!
Straight piping means to do cat delete...still run muffler! Then buy the Smarty Jr. safest programmer on the market and designed specifically for the Cummins.
The muffler on the '05 is more restrictive than the cat. The cat will raise the EGTs more because of what it does but it is a straight threw flow. The muffler is not. BTW, a straight pipe to me is what it says, straight pipe from turbo back.
