I have 04 C O Cobra 63k miles black int, in your price range, But you will have to add some HP to get that 600 mark
Puts down some where north of 465 HP to the wheels and maybe 530 HP at the flywheel.
It has LB Headers H pipe Flow Masters
SCT Custom Tuner
18 Wheels 10 1/2 rears 9 fronts
Upper and lower pulley
Accufab S B TB and plenum
Duel by pass heat exchanger and more.
Larger Polished coolant and intercooler tanks
New Spec 2 Clutch and flywheel
Runs Real Strong
With no issues
LEMENO IF INTERESTED
I will send you pics
Thanks
SVTP tax is going to kill you. For your price your looking at a car with 100k. If that's cool with you then I'd search Craigslist and autotrader as well.