What mod should i do next????

Well you can do some great burnouts or you can do some suspension mod's i.e. LCA's/UCA's, Subs etc, and put that power to the pavement....

open up that engine w/ some headers and finish ur exhaust...or if you got a nice pocket of money do a h/c/i swap...or do some suspension work so your stang can handle all that power to the wheels

SLVRGTCONV said:

I have eibach springs in the car and have a set of drag radials for the track days....

Click to expand...

The DR's help, the Eibachs hurt....get some LCA's if anything!

mm&ff has done a series on tb + upper plenums, the 75mm does make more power. Excuse me I just found the article, on the supercharged 4.6 the accufab 70mm tb+plenum was tops in torque and made only 1 less horsepower than the best 75mm setup(the 75mm setups made more power n/a).
accufab 70mm tb+plenum=+19hp,+17ft/lbs
accufab75mm=+18hp,+13ft/lbs
c&l75mm plenum w/accufabtb=+16hp,+11ft/lbs
trickflowplenum w/accufab75mmtb=+17hp,+13ft/lbs
dragonplenum w/acufab75mm=+20hp,+14ft/lbs

these tests were done on an engine with cams, a f.a.s.t. system, and longtube headers(no midpipe or catback), 10psi vortech t trim, ported pi heads, I dont think it used an air filter either but I could be wrong, and i think it had an electric water pump and no accessories. this engine was making over 600 hp so expect your gains to be slightly less. The trickflow piece was cheapest of the group, the accufab the best looking. You should also consider some suspension mods before the tb/plenum, especially rear control arms. I'm assuming you have had a dyno tune since you got the super charger, if not you probably need one.