apex downpipe question

[speedmo21]

im lookin at gettin a downpipe. if there a big difference between power gains between the 2.5" or 3". what kind of gains can i expect..like 10 hp? holler back

[SuperSpud]

usually, the 2.5" is fine. unless you plan on making lots of hp. I believe ppl have dyno'd both and saw no spectacular gains using the 3" over the 2.5".. maybe a hp or two. so like I said, unless you plan on making big hp, the 2.5 will work fine. it does for me ;)