straight pipe is a test pipe, anyway i just went to Extrme motorsports today and bout there flanged 2.5 inch high flow, since i go there so much and i got an extreme sticker on my rear windshield, they did it for 100 bucks with nut and bolt kit, well anyway my AFX UDP came in today also so when i get home i am gonan out in my UDP and cat, ill post what i notice, ill do one at a time to see the diffrence..

Boostless and loving it!
Way to many mods to list!