I agree with Chrisdoesntknow.
Also, I'd check the standard "problem areas" to see if they've been replaced. (Water pump, radiator, etc)
Just my $0.02
"In the road of life there are Bimmers and there are Bimmers"
Mods: Full JDM lighting, APC bulbs, ///M rims, Four wheel Brembo rotors, Bilstein Touring suspension.