....shortly after buying the 06 Ultra, I had a PC-3 installed, with custom Intake, true dual headers and bassini slip on's...showed a gain of 10 horse power on the dyno. Back Cylinder header comes out on top left side under my left thigh like "King's Ride" and I get a lot of heat on the left leg at stops...which I'm hoping to cool down a little with heat shields....But I really like the sound and the extra HP......most improvement I see is at increasing speeds.... Also had an oil temp guage installed and I'm thinking about an oil cooler but there are a lot of pros and cons concerning any noticeable cooling of the engine...... I figure it can't hurt anything to have one and it might prolong engine life so why not....