Quick update: Mustang seats arrived within 24 hours - went straight onto the 2009 RK. Beautiful. Picked up a heavy breather this week and ordered a TFI. Was expecting the TFI today, so last evening I installed the heavy breather in anticipation. As luck goes, found out late today that UPS won't have the TFI here until Tuesday of next week. No big deal. Though I probably shouldn't have, I couldn't resist. Finally had a break in the weather today, so I fired her up and gave her a spin to check out the heavy breather. Couldn't be more pleased! You gotta hear that puppy suck air! Plus, it just looks mean on the RK. Great choice, and thanks to those who promote it! Of course, without the TFI and slip-ons, I didn't expect much of a change, and there probably wasn't. Didn't matter - the look and the sound had me grinning like a kid. But here's the big news: About a year ago, I stumbled on a product made by Boyesen Engineering called the Power Xwing. To be honest, I thought it a gimmick, but I kept my eyes open. In August, I was flipping through a magazine and came upon a write up on this thing, and was quite surprised to find the authors solidly convinced this thing does what it claims. Rather than get into the specifics, here's a link for those interested in checking it out: Boyesen Power XWing . When I purchased the heavy breather, I noticed a sign at the dealer selling this product at 50% off. Having wallet in hand, and being at a dealer, what choice did I really have? Long story short, I took the above test drive with just the heavy breather installed, came back, took it apart, and inserted the Xwing, putting everything back together. I did this to compare the response with/without the Xwing. I'm still stunned. I can't stop grinning. I'm almost afraid to see what will happen when the TFI is installed along with slip ons. This thing is everything they claim it to be. It completely changed everything from starting out through 6th gear. Bear in mind, I'm 6'2", 270 lbs. Just pulling out required a careful touch so as to not lug the engine or ride the clutch too hard. With the Xwing, all of that is simply gone. The throttle response is amazing. I used to build momentum through the gears. Now, it just flat out rips through the gears in a very short time. Mid range is rock solid. But what really got my attention was 6th gear. Previously, I had to be at about 50 mph to really use 6th. And there was no accelerating once in 6th. I'd crank the throttle and slowly, slowly pick up speed. Hills were not possible in 6th. Tonight, however, I easily slipped into 6th at 40mph, was able to accelerate quickly to 70, and pulled the same hills with no problem that I couldn't do before without downshifting. And the Xwing's s strong point is lower gears and torque! I could go on and on, but I assure you that the above is not an exaggeration! I'm wondering, has anyone else out there tried this product, and were your result similar? I'm blown away. Lastly, if anyone is interested, I took step-by-step pictures of the complete install including the heavy breather and Xwing and would be glad to post the procedure if anyone is interested. Again, this is on a 2009 Road King. Let me know!