They are a bunch of identical axle backs on ebay, I almost think the same company produces them and then just get stamped with someone elses logo. To be honest it was random last year when I even chose Top Speed and not one of the others, only because Top Speed has sound clips. Here are a couple:
Nissan 370Z 09 13 3 7L Stainless Performace Axle Back Exhaust 4" Tips 2 5" Inlet | eBay
09 2014 Nissan 370Z Cat Axle Back Axleback Catback Exhaust System Z34 nismo New | eBay