Honestly I would pass on that car.
The only way I would buy a high mileage 335 would be if I personally knew and trusted the previous owner (or if it had a good warranty attached to it). At that mileage you are past the extended warranty for turbos/wastegates and are creeping up on the expiration of the HPFP warranty.
Nothing wrong with buying a car that has been modded, so long as you know it had been properly cared for and maintained. The problem here is that you have no way of knowing that.
And a clean carfax has nothing to do with the car never having been in an accident or having extensive body work -- don't trust what carfax says.
2008 E90 335i // Black Everything // photos
COBB tuned / QTP e-cutouts / Helix FMIC / cp-e DCI / AWE BOVs / Black M6 wheels + Toyo Proxes
(and yes, I am a girl)