I put on a exaust made by stan headers and wow the the difference. it is 4" from the turbo back and it fit in real nice with plenty of clearence every where. It dropped my egts 150 deg. at an idle and gave me another 2 pounds of boost. its not very loud because it has a donaldson muffler but has a nice throaty sound to it. It made my turbo spool up faster too. wasnt cheap but it was worth it in what i will save in fuel it gave me another 2-3 mpg.