[JFP in PA]

Depends upon the modifications, and often more importantly, who did them. We often do a “pre-purchase” inspection on cars coming from third parties, and some of the things we see are truly amazing. Often, the new owner ends up having to fix some of the problematic mods, so we dial those facts into our recommendations.

Things that potentially improve engine life (IMS, larger oil cooler and/or third radiator on a base, 160F stat, spin on filter, Accusump, etc.) would be a plus. “Brand X” exhaust systems (we have had to redo several that droned so bad they were actually shaking the car apart), systems that require defeating the O2 sensors, weird DME re-flashes, any wiring that looks like it was done by “Sydney the Wood Butcher”, most non-Porsche suspension mods and lowering (you would be amazed at how badly some of these cars ride), and any car that seems poorly maintained (oil/coolant leaks, MIL’s or codes, no service records, etc.) would be either “deducts” from the price, or “avoids”.

We have “green lighted” cars with significant mods done by shops or individuals known for the quality of their work, and the buyer’s have generally been very pleased. We have also had customers buy cars we suggested they pass on, and they have ultimately paid the price for their decision. It is always a good move to have an indie you know well look over a car beforehand, they will usually provide an accurate, and more importantly, a dispassionate review of the vehicle…..