Well I bought an MBRP straight through muffler then took it off and just ran straight pipe for a week then put MBRP back on just now, and I can tell a difference... . It seems to me that the 05's or maybe all the newer dodges love a little back pressure cause it feels like its more responsive and may have gained a few ponys, and on top of it all my EGT's didn't change at all. Just thought you guys might want to know this for anyone thats thinking of doing exhaust MOD. Although i don't have that many MOD'S done to my truck YET. So that verdict could possibly change..... Just thought that was some good info