If you wanna try some american big-pimping in something a little more stylish than a GTO a nice used CTS-V can be had for between 10 and 15K nowadays too I believe.
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2004 S60R - 350+ HP, AWD, Custom FMIC & Exhaust, Active Suspension & A Big Set Of Brembos
Crazy Camber, Stretch & Poke; its the new triple-stack-bleacher-wing ricer fad that's all the rage nowadays, lol