One thing i forgot to mention is that my zx has a true twin exhaust, ie one cylinder bank to one and the other bank to the other exhaust and it sounds very different when people put a single exit system on.

The G35 looks like a twin but don't know if there are twin pipes or two seperate exhaust pipes?

I personally always prefered the sound of the skyline to the 300zx so i guess i prefere a single exit exhaust anyway.