I am running the mbrp exhaust my question is looking for a little more sound out of it can I do anything to make it louder or do I have to replace exhaust? Other question any mufflers fit in this system with not much modification?

 

Replace your cats with high flows.

 

Hmm any ill effects engine lights or running concerns?

 

You may throw a P0420 and/or P0430, but a Gotts O2 mod would fix that.

 

And a custom tune disabling rear O2 monitoring would harmlessly keep the po420 out. Just be sure to try to have the cats welded outside of the truck, remove the downpipes and install on a bench I mean so there is 0% chance of an exhaust leak. I've been there done that, PITA to weld on top of the cats while in the truck, leak leak leak.

 

Well here is what I am thinking of trying first seems cheapest and easiest just removing the muffler. Thinking right after stock y pipe putting on a y pipe into 2 pipes run them back to the mbrp pipes. Not sure what size I need to slip over factory pipe?

 

Well did it removed muffler replaced with y pipe and 2 straight pipes sounds awesome.