They are just another brand of glass paks. When they first arrived on the scene it was the header flange on one end that allowed them to be bolted directly to the headers that made them unique.
yep, basiccly a glasspack with a turndown that you bolt straight up to your headers. Ive got them on my 360 duster.......if loud is what you want then loud is what you get. its loud when it idles, its loud when its up to speed, its loud when you put a load on the engine.....:). Its the kinda loud that you cant hear your cd player because the exhaust....i love it. Sorry i dont have a sound clip. some people think its annoyingly loud because i cant have a conversation in my car thanks to the exhaust, but thats how i like it