I had a mid 90s prom chip in my 91 ZR-1 that I posted with a pic about six months ago. The car ran fine, with the exception of a backfire or two downshifting. And I wanted the overriding feature that ran car in full power 100% of the time without turning on the valet key. I chose the ZR-1 specialist chip. So along with several other benefits the chip offers, it eliminated the occasional backfire and no need the use of the valet key! Thanks
Sent from my iPhone using
ZR-1 Net Registry