Does anyone know the difference between the street series mufflers and race mufflers?

Where is the best place to get the mufflers i know people that got them for like 95$, but i don't know where they got em?

And does anyone have sound clips of these mufflers?

And if you have the mufflers tell me if there good or not and anything else?

 

I Got Magnaflows put on my 2002 TL-S and like them. I got them at Van Iderstine in Jersey for like $250 for the pair or something, but i didn't really shop around at all. They look dope and aren't loud at all. they're louder than the stock ones but not by much. i felt a lil diffence in the driving after they were installed but not too sure cause i didn't have it dynod and it was also only about a week old so...