Question for Steve or anyone. I have replaced my muffler for a resonator so it is loud but nice. Still have cat and with stock pipe 2 inch diameter. The question is if I am driving this car hard 3rd speed and 4th mostly.. that mean reving the engine up to 5500 rpm, should I be concerned about engine valves since my exhaust has been modified. I don't think back pressure is something I want but few ppl are telling me that I need back pressure. My car is 1987 300ZX N/A 2 seater with 5 speed tranny. Car manufacture date is 01/87 so I guess I don't have "W" engine (still need to confirm this)
> will be running fresh synthetic oil. Synthetic 5 speed 75W90 oil and
differential as well. Anything I should be concerned with? cooling is okay and timming belt is about 6000 miles or less
Thanks in advance.
Paul