just as an fyi, i got my 12599, 3" di/do magna put on today routed over the axle then dumped, i couldn't be more impressed. There is no drone inside as was with my flowmasters, Has more of a refined tuned sound if that makes sense. It's a lot deeper of a sound than the flowmasters were. I'm not sayin yay or nay on any kind of performance gain, it's kinda of like a plecebo, i don't know if its just me thinking i've gained anything or not.

 

Nice Extreme, that is the muffler I'm thinking about going with and the same exact setup where it dumps right after the axle.
You really need to get some sound clips on that thing, I would like to hear it.

 

Is that the muffler with the built in x-pipe? Also did you delete your cats in any way.