feetsbig
Active member
Hi,I recently bought a used 15 Viper with the MPI 190 kit and the intercooler upgade kit.Its pushing about 6psi boost on 91 non ethanol at 5000 ft . Can I turn up the boost a bit and at what point is a head shim and studs needed?What is the recomended shift rpm and at what rpm is the rev limiter?