When I purchased my truck it all ready had a 4" exhaust. So I have no starting point to begin with. But today I was rea-ended on the freeway. The 5" tip was bent up into the tire causing pinch in the 4" pipe. I pulled it away from the tire (used a 4' pipe) but couldn't get the pinch out completely out. And all's I have to say is WHOA. What a slug. The turbo doesn't spool up very fast at all and the boost levels are way down. And of course the EGT's are hotter.

So if anybody out there is on the fence about a larger performance exhaust, GET OFF IT!!!! GET yourself a larger exhaust NOW. It is well worth the money...........................