Well I am new here and I wanted to let you all know, I got flowmaster 40 on my 2007 hemi ram with the MDS, it is 3in inlet and dual 3in outlest, I had the rout the exhuast out in front of the passenger side rear tire, well I will say this, I have always been a fan of flowmaster but the new delta flow muffler is not evan close to the original. I do not recomend it if you have a ram with MDS, I left the forward resonator as well, and when the MDS kicks on the truck sounds like crap, any body think if I step down the tail pipes to 2 1/2 inches and than back to 3 inches if it will make a differance. or should i just deal with it.