Quote Originally Posted by st8kfinger View Post
i found a nib 4" stainless duramax exhaust with a muffler and 5" tip for $250 shipped to my door, so will it hurt or help my hp?, that is my only concern, i like the overkill part of it. im getting the speed_daddy ebay lt's right now and the 4" exhaust has a 3" to 4" adapter so all i would have to do is weld a flange to the adapter and do a little trimming on the length and i think i will be good, so no exhaust shop or bending will be involved, all the hangers and t bolt clamps are included.
As far as I know the speed daddy headers are 2.5" collector...if you don't have LT's currently I would save up and get good headers...like kooks or stainless works. Just my .02