My old MagnaFlow cat back has served me well but is completely rusted together and I am ready for something new. From the mods listed below in my signature, I am guessing around 425-450 HP at the crank (and more with ported 243s, hopefully in the winter). I was thinking of upgrading to a 3" single in/3" dual out muffler and running duals out the back very similar to what I have. Basically just bigger. The other option would be to run dual mufflers in the same exit fashion. I really like my MagnaFlow but the drone kills me, especially since my cats are gutted. What other muffler(s) made from 304 stainless would be worth checking out?

 

You can get a longer case muffler. Will help the drone. Borla also makes some nice mufflers.