The current set-up:

2003 GT
BBK longtubes & x-pipe
Procharger 8psi 3Core Intercooler
Diablo tuned

How far is it safe to raise the rev limiter? It is currently set at 6050RPMs. I have heard 6250 is safe?

 

why would you want to raise it? that extra little bit isn't really gonna help since your car probably stops making power at like 5500