I've got a set of Borla Stingers. They're loud. Were on my car for 80k miles. I didn't notice any drone. They need to be cleaned from sitting. $300 shipped
I've got a set of ET streets on some old plasti dipped fanblade rims. They're 265/40/18. Right side has more wear than the left side. They've got maybe 25-50% left on the right and left side respectively. I'll give them to you for a hundred if you want.
I dynoed 320/303 with virtually the same setup on a Mustang Dyno. 127300's, JBA LT's O/R H, C&L Racer intake, Spydershaft and 4.10's. Sounds about right to me.