Should look for normal things 1st like any car corrosion, panel matching distance between panels. Service history is a must, listen for the aux belt squeaking, blue smoke any rattles. Knocks on full lock while stationary. When driving clutch slip an look for worn shocks. Look for leaks in the passenger footwell. See if the car comes with the leather wallet, 5th full spare wheel, smokers pack all little bits that can get lost owner to owner but can retain its price. With modding the chassis can handle 280+ an this can be done with just a new actuator chip manifold and de cat an updated chargecooler pre rad.