I put on the MBRP (mbrpS5085304) cat back exhaust on today. So of course after putting the tk. back on the ground and starting up, sounded really good. Then had several codes pop up, cleared those. While driving the drone sound not to bad in the cabin, but while DFM is active, really makes truck sound like shit. So guess I'm now going to invest in a pulsar lt. Hopefully it corrects the problem.