I just bought a z with similar modifications but larger turbos, larger injectors and maxed out high-end suspension modifications (which the car you described does not have) with 98000 miles for $11,999. Granted, my sound system isn't worth as much as you quoted. I bought new wheels and tires for $1700 and AP racing 6-piston brake kit for $1300 for a grand total of $14,999. From what I have seen, my car (530 hp) could smoke this Z and looks better too. So, for what it is worth. Hope that helps.
