I got my SESG back from the dealer today after installing the Vance and Hines basic slip ons to replace the stock mufflers and tuning with the Super SERT. According to the tech I got about a 6 hp/8 TQ gain (85hp/104tq). Not too shabby for just adding mufflers and tuning. AFR was dropped to almost a flat 13.8 across the board, so that should cool it down a little too. Seat of the pants fun dyno definitely noticed a difference. Definitely more kick now. The most impressive part was the sound. It sounds like a Harley again, has a nice rumble to it now. I guess the CAT quiets things down a little though as the mufflers have a 2 1/4" core and are actually a little quieter than the V&H Ovals on my SEUC. Of course the SEUC has true duals too and no CAT. Going to run for awhile with the CAT installed and see how it goes. Right now I'm not feeling the heat that a lot of people have said they feel above the collector....so we'll see.