Maybe Spintech, but i dont know really , it truly has a unique sound, you'll love how quiet it is inside your car. but it is kinda loud outside, they are in my opinion, near perfect.
Thanks, Whitey, better late than never.
I put the Moroso on my Bronco with a 351M and single exhaust. Man, was it LOUD. I looked for a resonator to tone it down a bit, and settled on an IMCO single chamber (Flowmaster clone). I attached the IMCO directly behind the Moroso, then ran the tailpipe out behind the rear tire.
This setup gives me a deep, aggressive tone outside the vehicle, but quietened it down inside the cab. Just about perfect.
The Moroso is advertised to flow better than an open pipe, and I believe it. My SOTP dyno shows more torque on the low end; it's a very good muffler in my opinion.