ORIGINAL: samseed101
Get yourself a nice set of heads to go with your TB, cam, and intake manifold. You should see decent gains over the stock E7s. Even if you have to go to a junkyard and rip some GT40 heads off of an old Ford Explorer, it's better than stock. Judging by your sig, you already have gears and a shift kit so you're looking good there. And if you have full suspension, then you should be gripping fairly well.

A 100 shot should be safe for you, as long as it's setup properly.

But if you're looking for nice gains, a supercharger will do the trick. But even if you do get a S/C, I would still swap out your heads. Those things looks like your bottleneck right now. (if you have better TB, intake, headers, cam.)

ORIGINAL: Jugador
i'd imagine it's pretty hard to put 5.0 heads on a 4.6. 4.6's have ****ty options as far as aftermarket heads

ORIGINAL: ponysnake99

well...sounds like you might have yourself a nice setup going...as for basic mods? a good TB, upper and lower intake, heads (patriot makes some of the best in the business), you'd probably want to gear your cams towards a turbo/supercharger if your looking to go there (crane, crower, comp cams etc etc)...you've pretty much got the top end topped off for f/i, now without having to dive into the bottom end, id recommend a supercharger, because your gonna push the limits with boost and a 100 shot which isnt good for cast internals...it will get you the times without having to deal with such things as turbo lag and the excessive heat...i have a procharger on my cobra and am very pleased with the results
oh yeah, your not going to make it out without a little shaving of your wallet...modular parts are a little more expensive than most ppl would like...but just think of it this way...you have to pay for about half of what the cobra guys have to buy top end wise
if you want to shop a little yourself, here are my two favorite sites to check www.seanhylandmotorsports.com, www.modularmustangracing.com