I've got the 4-cyl but thought I'd chime in on muffler question. I bought a Magnaflow cat-back for mine and the muffler had two hanger hooks. I looked in the service manual and thought it showed two hangers for the 6-cyl; just one for the 4. I figured they just used the same muffler for both. Anyway, my OCD wouldn't let me have a hanger hook just sitting there w/o being hooked to anything, so I paid $10-$15 for another hanger and bolts and, sure enough, there were a couple of threaded holes in the frame right where they needed to be. There was definitely less "wiggle" in the system with the second hanger connected. Anyway, just FWIW.Second question is in regards to the Magnaflow muffler. The muffler looks like it was expecting two hangers, but my truck only has one. This muffler is a bit heavier than the OEM one. Should I get another hanger or will it be ok once I get everything bolted and tightened up?
PS I got the parts from my local dealer.