Which Performance Chip do you have?

[XfireZ51]

Originally Posted by Jim Nolan

A few years ago when I had the SGC 475 package done on mine it was dyno tuned and e-prom reprogrammed. What I didn't like about the tune was when you let off the gas completely you get a backfire. I had an extra e-prom I sent to Marc with all the mods on the car and asked him to program it. I have run both e-proms and as far as power goes it feels about the same. Unfortunately I live in an area that is not dyno heaven so I can't find out what my rwhp is on Marc's chip. Any thoughts?

Jim

Is there a track somewhere? See what your trap speed is.