so ive recently taken my 91 gt easily to 7k while doing donuts......isn't there a cut off at about 62ook? just don't want to blow the engine has a few mods like cai,x-pipe,flowmaster,headers,no cats

 

Yikes!! I would keep it under 6k!
Plus for donuts if you need to redline to swing em then i would look into your motor kuzz it should easily whip them without redlining!
Could be your gauge cluster thats not accurate!

 

.....I was having problems with with code 91 before and it was running like crap but got I fixed already with plenty of power to burn um and get sideways now........

 

Let me guess.., you live somewhere in the bay area.>?