Trading 09 370z for 05 STI

2011 Nismo#91

First rule don't buy a modded car, who knows where the owner or installer cut corners to save time/money. Only exception if you know the car very well and it's history (like your neighbors car).
Second, someone else's mods really shouldn't be factored in to the price if anything deeply discounted as if you had to part them out and sell them fast.
Finally your trading a (1/4) lower mileage nearly half age car for an even swap. The engine may be newer but the rest of the car is old. 10+years of aging on all the plastic and rubber and paint.