Had Hard Krome 2.75 Big Straights put on and also had it Jetted. The Hard Kromes sound great. Nice low tone while cruising and will wake the dead when I snap the throttle. I previously had the Roadhouse 65 slip ons.... HUGE difference with full exhaust! Very deep and throaty rumble. Now for the jetting.. I can feel a substantial difference in power. My throttle response time is almost nothing, especially going from 2nd to 3rd. I had noticed with the slip ons that the bike felt sluggish here before. Keep in mind that I have only put about 100 miles on it since these changes but so far so good!