I just acquired a beautifully restored '95 300ZX, NA Coupe. One of the mods is a Magnaflow cat back exhaust. It has a nice exterior sound to it, although it's quieter in comparison to the Borla ATAK I have on my Mustang. But the inside of the ZX is a lot louder than the Mustang by comparison. Do any of you have any experiences with some of the other popular choices for the ZX, such as HKS Hi-Power, AMS, or B&B, and how the interior sound level compared to the system it replaced? I love the car but an hour long drive in it left my ears ringing for quite awhile.