I've been running an Xcelerator for about a year now with no problems. It takes a while for the bike to re calibrate but once it did it runs great. I can't really give any fuel econ stats because I didn't take any long trips before adding it. I can definitely tell an improvement in power. I also have a Big Sucker Intake and RC True Dual Headers that were added with the Xcelerator.
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2010 FLTRX, Denim Black, RC Majestic 21" w/ Matching Rotors, Fairing Factory Stretched Bags, RC True Dual Headers w/ 4" Slip on's and Wrench Tips, RC Xcelerator, Big Sucker Intake, Yaffe 10" Monkey Bars (Flat Black).