Motordyne E370 and Art pipe is best combination for the 370Z IMO. I've had the exact setup you're looking to get art pipe + ark grip. It sounded great. Very minimal droning, I didn't even notice it much, it is tame at cruising speed but roars once opened up. Honestly, I sort of miss that set up from time to time but I wanted a more aggressive tone so I am running a temporary set up now while saving for an new E370, it is not cheap. If you're tight on budget go for the ark grip.
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