Not a fan of Magnaflow on these cars, so I went with a Hooker Aerochamber. A lot of GN guys run these and I think it sounds awesome! It can have some drone, but I think that is with every aftermarket muffler. Very euro sounding IMO. Really it all depends on what you like though.
YouTube - SRT6 Custom Exhaust
YouTube - SRT-6 0-60 test