Spintechs- Which Ones?

[420nitro]

Don't have a sound clip of my car and if I did it would only be misleading. (400+ cubes & bigger exhust)
As goes for a what muffler, I would say the sportmans sound somewhat like a 3 chamber Flowmaster. The Prostreet sound like an old classic 2-chamber Flowmaster from back in the day. (early 90's). I would say if you want it loud get the pro-street. Sportmans or quieter, and the Sportmans xl's are the quietest.
These are all in my opinion, so someone else might differ.
Good luck

My old combo was a 306 w/ 3 inch Prostreet mufflers and it sounded wicked!!!! To loud for the street though, (police magnet)
If I had to guess I would say they sounded like a 1 chamber.