I would go here-https://classicmusclecarexhaust.com/
. They have sound clips with all of the systems they sell and have some good videos in the 'Exhaust 101' section. They carry Pypes, Flowmaster, and MagnaFlow systems, along with Dynomax mufflers. You can get the Pypes X-Pipe system without mufflers if you want and use Dynomax or even FM 50 or 70 series, which are mild but still have the FM sound. FM 40 series is loud for sure. Pypes Race Pros are fairly quiet but bark under full throttle.