Larger throttle body ?
 

I have a 2001 GT and i want to modify it. I am looking for advice on mods. Should i get a cold air kit or just K&N filter. I am thinking about a MAC cat back or just get 2 chamber flowmasters welded in. I know i wont get much power from either. Will i benefit from fitting a larger throttle body though, i read somewhere it's worth about 10 hp but i don't believe it on a stock motor.

actually from what ive heard and read you actually either gain nothing or lose hp. especially on a near stock application such as yours. if i was you i would get a h or x pipe first then a set of 373 or 410 gears.jmho.
leon

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96 stang,ported 99 heads, 99 intake, 99 cams,Steeda power pullies,Kirban adj.reg.,Pro-m 87,24#inj.,70mm t/b,BBK longtube headers,Bassani x-pipe w/cats, Dynomax ultraflow catback,iat mod, home depot ram air, k@n,373's,cobra brakes,fms spings, tri-ax shifter.
best et 13.80
best mph 103.3
bfg street tires,bakersfield, ca

Ive heard a larger Throttle body on the pre 99 4.6 will hurt performance, but I heard it will produce extra power on the 99+ 4.6's.

Its hard to trust the aftermarket companies ratings. They tend to really over-exagerate in some cases.

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64 1/2 "D" code Red Mustang Coupe. 289, C4, 3:1 rear gear. Mallory duel point. Ported & Polished 65 heads shaved .01 with 351 windsor valves, 11:1 comp, 1.7:1 sled rockers, blue wolverine lumpy cam, modified autolite 4100 Hipo 4 barrel. GT Apperance pkg. Period white wall tires. And to many others to list

2000 Perf Red Mustang GT. 5spd. BBK Underdrive pulleys, Flotech off-road H pipe. Hurst T-Handle

64 1/2 red 6cyl coupe. Auto. project car. Mods, Rust, rust, and more rust