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Message: <blockquote data-quote="xsoutherngun89x" data-source="post: 273418" data-attributes="member: 10002">Well headers on the 4.6 are a PITA from what ive heard(thats why i dont have any on yet),but my setup is a UPR o/r x pipe and weld in flows. ure only really going to see some small gainsfrom the muffs(if any) your gonna get your moneys worth on headers and o/r mid pipe. Your personal opinion is the only thing that matters when it comes to the midpipe. whether its "H" or "X" you will still see a little bit of a gain. Long tube headers are better than shorties, but are much harder to install and the gains you see will be in the bottom end. If you are just goin after horsepower cheaply i would suggest a good nitrous setup with a tune for it. that will give you the most bang for your buck. However, our mid pipes are very restrictive due to the 6 cats that is has on it and the stock manifolds are s***. so both will help you now,and later when u do more substantial mods. PI intake is also a good way to pick up a few horsies on the cheap.</blockquote>