i have an 02 gt... how much of a diferance would headers make on my car? i plan on doing headers with an o/r Xpipe and flowmaster mufflers then liek 2 3/4 out the back..do you think this is a good exaust combo.. sound and performance wise??

 

25 hp
quicker reving
2 1/4 " is sufficient. too large will hurt ya.
off-road h-pipe w/ out the cats will also gain hp.

 

you'll see a larger gain from long tubes vs. shorties. Basani makes a good mid length header..

 

stock size are considerd shorties im guessing??

 

stock size are shorties, then mid lenths and long tubes. long tubes will give you the best gains but are a pain in the ass to get on and one side has to be removed to pull the trans. i would go with a pro chamber and flowmaster cat back(which i have).

you can listen to most mustang exhausts at MUSTANGEXHUAST.COM

 

Headers are definately worth the buy. What you have already thought of putting together is a good exhaust setup, I'd go with that.

 

I have both shorties(FMS) and now have LT(BBK's). On the top end did pick up much over the shorties but did pick a noticable amount in the mid range. Longtubes suck for tranny removal cause you have to remove the passenger side header. I would recommend a mid lenght header(Bassani) with a 2 1/2" mid pipe. Don't got 2 1/4" cause that's what comes stock. Go bigger. Just don't get an x-pipe with any chambered muffler. Sounds nasty. If getting a x-pipe go with a straight through muff. H-pipe ofcourse loves chambers. -Mark

 

so you dont think x pipes with the flowmaters are a good route for a decent sound?? the blows i already have the mufflers and can get deals on everything i want to hear them all in person, its so hard to chose when you cant hear it!

 

x-pipe and chambered muffler are a bad choice. sounds really raspy

 

a high flow cat x-pipe sounds good with flowmasters because it muffles the tinny sound, i would tend to agree with figment on the sound quality of an off road x-pipe on a mod motor with flowmasters, too obnoxious, i had 3 people in 1 week trade their x-pipes in and have h-pipes installed because they couldnt stand it anymore, as far as headers i would bother with shorties, the only shorty headers that actually pick up any power on a stockish type 4.6 are the BBK's, longtubes are good for power but like everyone said what a pain if u have clutch or tranny problems...etc...the bassani's are a nice choice for the midlength design although they arent cheap..if u give me a call at the shop tomorrow i can get you a price on teh bassanis, 727-571-1996

chad