I would be dropping the next generation Z06 V8 into my ZX5 along with the rear end transmission and all the IRS parts, then I would turn the car over to John Lingenfelter, and inform him that I have unlimited money so do what can be done. I would be returned to me with about 600hp (I would want to be able to floor it without breaking my neck, so his 1400hp turbo version would be a little too much) and it would be my summer car.
Then I'd completely restore my poor old Jetta
