I have all the normal exaust stuff on my 7.5. If I just replace the muffler with a straight pipe, will I get a bunch of engine codes. Will it help me or is it worth messing with on my stock machine. Thanks. Bill

I have all the normal exaust stuff on my 7.5. If I just replace the muffler with a straight pipe, will I get a bunch of engine codes. Will it help me or is it worth messing with on my stock machine. Thanks. Bill


I still have the stock exhaust, and just installed an MBRP dpf-back exhaust, which eliminates the muffler. With everything else in place you will get no codes. Easy swap, sounds quiet but nice tone at wot, and eliminates that GM afterthought of an exhaust on the LMM's.

Jody

Mine has the same DPF-back MBRP muffler delete tailpipe. An actual muffler really is not needed on the DPF trucks. It is just there to comply with vehicle codes (state laws that say all vehicles must have mufflers).

The tone didn't really change. I just wanted a better looking tailpipe. It does a tiny bit for performance, but not as much as losing the rest of the stuff would. If you are even slightly contemplating dropping the rest of the equipment out of the exhaust, just wait and get a turbo-back system as discussed in several other threads.

Here is the muffler delete pipe. There WAS a muffler just aft of the flange.

http://www.hotboat.com/image_center/data/520/MBRP1.JPG (http://www.hotboat.com/image_center/showphoto.php?photo=136653&ppuser=10889)

Thanks guys. Thats what I'll do. Thank you for your time. Bill

got a o6 2500 took out the kitty and put a straight 5 inch into a mbrp muff and no codes popped up so far so good

got a o6 2500 took out the kitty and put a straight 5 inch into a mbrp muff and no codes popped up so far so good
This would be for LMMs only. Your LBZ has no sensors in the exhaust.

Thats what i want to do, mine is an 08' same LMM tho anyway, I want to straight pipe it but with that wierd tip on the end that from what i hear has a job besides bein ugly, goin DPF back deleting Cat and Muffler im hoping for lower EGT's , any imput would be appreciated