Originally Posted by TEXCRAWLER
That sounds weird. I put a MBRP 4" turbo back straight pipe on my 04 6.0 and it runs like a spotted a$$ ape! Wished I could help. I'm sure your still under warranty, take it in and have the dealer run a dignosis on it and see if you may have a bad injector.
i SERIOUSLY dought it is an injector, truck has 20 k miles,stock, dont know if loss of back pressure makes it run weird or what. although i do notice less heat emitting from the tail pipe, even touched it after 20 min of driving it wasn't scorching hot like the stock exhaust. gonna talk to my shop and see what is up...