my friend has an 86.5 supra na 5 speed. and i have an 89 na i converted it to turbo and 5 speed. at 35 mph in 3rd gear he was at 2250 rpms and when i was at 35 mph in 3rd gear i was at 2500 rpms. i just replaced the clutch in my car so its not slipping. i thought all na's were 4.30's. why would he be at lower rpms then me?