Before you guys go out and purchase an aftermarket 4" or 5" cat back system get a load of this. We straight piped my new 07.5 today and it has made maybe 1% difference in (in cab) noise. Factory muffler is already straight through.

 

How much did they ding you to do the delete? I am thinking about it myself. Seems like the three "boxes" the exhaust already goes through would muffle the noise quite a bit.

 

The biggest cost was for the chrome tip. The whole job was about 125.00

 

Did it make a difference in performace? What sisze pipe did you use...Thx

 

Engine runs cooler and pipe out of DPF is 4".

 

So I guess that it's notmuch louder outside the cab either. I have been wanting to do that also if not just for the looks of the shiny stainless tip. I have heard that since the 6.7's go into regen mode the egts get pretty high and discolor the tips.

 

Ok I would need 4" straight pipe...Any other tips you could share? I don't have the truck yet, Just special ordered it...Will look allot like yours :-) Just reading up and trying to get ahead of the game...Thanks

 

Sure is a nice clean Drive Shaft you 6.7L guys have. The 5.9's are rust buckets!!

 

Aluminum vs steel. I'll take the rusty ones.

On the 6.7 I think the mufflers are really only resonators.

 

anyone know if installing the delete pipe voids the warranty?