Exaust Question and info needed..

[G-Body]

Heah guys im looking to by an exaust for my 48 chevy pro street and im looking at a Bullet muffler something under 6"s around looking at the Moroso Spiral Dynomax and the flowmaster bullet but have never really heard any of them on anything and was wondering if anyone had any knowledge of these exaust's and there performance and sound.
Im looking for a deep flowmaster type sound but only limited to this amount of space running the exaust on the outside of my frame under the car just inside of the rockers tucked up tight for a clean cant see the exaust look. Aswell as being functional, Beacuse my master cylinder is mounted on the inside of the frame and im running fender well headers too i want a 3" exaust and muffler any suggestions car will be a street car and raced.
Engine is a 406 with 210 AFR's