[m5james]

I don't know how muffler delete only sounds, but catless downpipes increased the cold idle sound and give a slight drone when the truck is trying to be lazy by forcing itself into 6th gear even though it's going uphill. Any other time, it's fine.

IBS spoke with M6Beast (creator of MSR) and after listening to his exhaust videos (search for them on YouTube), I'm in love. He said he'd likely never make an exhaust for us, but he did recommend that I replace my muffler with Vibrant resonators (it'll look like the Challenge when done), which use purchased and have yet to install. I'm also going to add an x-pipe since the S63TU engine has one, yet we don't.