I've been reading ZCAR.com and I don't know why everybody says that you MUST convert to zxt wiring harness when converting NA to turbo. I run a '79 zx NA with a stock NA motor with a turbo, larger injectors and starion intercooler. I was dynoed at 225 at the wheels and run consistent 13.4's on street tires. I have my streo an air conditioning too and use my STOCK ECU AND WIRING HARNESS. The car is a blast. The guys at Z-1 auto did MY conversion and to my knowledge have done quite a few.