Originally Posted by himself

Even pristine cars may have been to the track once or twice. But this would not keep me away from a 6GT3, as these things are pretty much bullet proof. However, there are some tell-tale signs of being on the track that almost anyone can verify pretty easily:

• heat cracks in OEM steel rotors - front or rear (although this car appears to have PCCB)
• PCCB optioned car now with steel rotors
• slotted steel front rotors
• upgraded or replaced splitter [check mounting spots]
• upgraded or replaced brake ducts [check mounting spots]
• upgraded brake pads [e.g., P50 for PCCB, RS19/29 for steel]
• balled up rubber in the fender liners
• balled up rubber in the radiator openings [just reach your hand in and feel around]
• underbody scrapes or missing aero
• rubber streaks on paint or windshield
• upgraded drop links, toe links, dog bones
• carpet cut outs for roll bar
• wheel studs
• "no seat belt" warning chime disabled
• over -2.5 negative camber
• 4 or 8 degree wing shims on (or in included with car)

To the OP, good find and good luck!

-td