Just out of interest if pre- 96 sti and wrx's have the same heads, how come the sti /wrx ra , has a higher rev limit , just i have a pp chip/ecu from a wrx ra with the higher rev limit, fitted in my 95 wrx and was told not to rev it past 7000rpm as the hydraulic valve lifters can't keep up past 7000 rpm, not that i want to rev it past that , just wondered whats different , cheers