Well my cousin has the Borla cat-back on his 4.6 DII and I love the sound but am not willing to spend $650+. So what I did was order a Thrush fully welded muffler from Summit Racing and had it installed. First I left the resonator on but after a quick spin around the block I had it cut off and replaced with a straight pipe and a turndown. The tone with the resonator still on was deeper but not louder. I paid $42 for the muffler shipped and another $40 for my muffler guy to weld eveything in for me. That $82 sounds alot better than $650 plus it's probably different than whatever someone else has.

 

got any sound clips?

 

Sorry no sound clips.