Touche, but you didn't say you had the full Roush stage 2 suspension, you only said Roush Stage 2 sway bars.
I still say UCA, even if you dont drag race it still helps to keep your power on the ground.
Its never a bad time for an aftermarket stereo system either.
If you want more go, a set of headers wont do too much but will help more than hurt and so will a bigger throttle body. Underdrive pulleys are another consideration if you want more go.
Otherwise, you might be looking at saving up for a big mod, like F/I. Supercharger, turbo, etc. or building your motor (forge/stroke or pnp heads/cams) but its gonna cost a pretty penny.
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Black 2005 Mustang v6, 5 speed, IUP, EUP and Leather.
Razzi 1/4 window scoops, Mustang GT Sway Bars, Flowmaster American Thunder Single Exhaust, Clear Front Turn Signal Lenses, Demolet CAI, X-cal2 91 tune, Hurst Comp/Plus Shifter, FRPP T-Lock, Ford 3.73 gears