The Lowest Time I got in 1/4 mile was 14.86 @87MPH As For Power it reads around 117 After all my mods so far. But I still have to hook up my zex kit so I think I can do allittle better on the time plus I have a z6 head and I am going to be doing the exhaust system with headers cat and exhaust. Plus some other things.. But as for mR. Dyno I think it is pritty acurate plus it makes cool graphs for you on your laptop. I think it is better thank the Gtech I had that but it didnt work to acurately.