I dont think that just the engine for $6K is that cheap, just for parts. If the engine & ECU will run about $4K, another $2K should be more than enough for all the other basics. Remeber I'm just talking about a mostly stock engine, nothing else. Not including the purchase of the car, the chassis will need about $4K in mods, plus another $1500 to upgrade the drivetrain, and $1K for the GTS tranny.