Originally Posted by 2004 Blazer
I hate to say this but both of you are ignoring bonified test results ! Those are referred to as repeatable results ! (science) I am not defending "other" manufacturers,I am merely pointing out that performance gains are 100% possible with bolt on exhaust from Gibson. (documented) That was the questiion asked by the OP ! Opinions are not scientific or relevant in this case ! Bringing other elements into the conversation to prove or substantiate a point is a lame . If you can't accept the "FACTS" or prove them wrong you have no business giving advice !
the facts are,,,, the pcm will adjust any mod you do to stock program, so without a tune no gains. Its in your head my friend