I would get Kooks if I did it again, but if you want under 1k, Pypes off road H and Pype Bombs, don't remember, but seems like that would be 700 or so and you can install yourself. Check it out on AM. It'll sound loud and mean. Then later you can add the L/T's.
In the market for a Fox body...
SOLD: 2007 Performance white GT Premium.
Performance: Eibach lowering kit, SVT wheels, Steeda Camber Casters, Steeda short throw, FRPP 4.10's, Airraid CAI, BBK 62mm TB, Brenspeed Detroit Rockers, Pypes Longtubes with O/R H and Violators.
For fun: Window louvers, 15% tint, Raxiom tinted taillights, J&L Audio sub.