Well, a couple weeks ago, I finally decided to try the XiEDs kit from Nightrider. I had debated on doing that or adding an oil cooler. Since I could not find a negative post on any forum about them and since it would have cost me more money to install an oil cooler and since that would leave me with hoses that could possibly leak, a cooler that sits there and doesn't look all that great on a Street Bob, I bit the bullet and ordered the set for my Dyna. I have a '06 and they make them for just that model, 88ci. It is because I found out that 06 dynas have a Delphi ECM that MoCo installed to test them before making them standard on all '07 models. So, I ordered and got the two plug ins in only a couple days. They shipped priority mail. I'll admit that is an awful small package for $110. So, I got the two harnesses installed very easily and it only took me 1/2 hr. I was sure ready to give the XiEDs a try. I no sooner got the bike started when I could actually feel the faster response to the throttle. I then had to run an errand and I sat at 3 or 4 traffic lights. I held my hand near the pipes and I thought I could feel a difference of the pipes being cooler. I have never measure engine temp before or after, but it is a seat of the pants kinda thing. So, I rode to the gas station and thought on the way to it, that maybe I should try regular for a test. I had to put about 3 1/2 gallons in to fill they tank. I rode the bike to work and back 4 days and the ambient temps where high 90's. Well, not one ping on regular and the engine sounded great and that little surge I used to feel in the throttle going through the lower gears was gone. I am just stating my experiences and not promoting a product, but I am glad I went to the XiEDs instead of oil cooler, which I would have worried about in cold weather, even though I would have gotten the adapter with the thermostat. I hope this mod keeps on being this good, if I ever have an issue with it, then I will post that too. I should mention that Nightrider says you can get false engine codes. I haven't checked, but I never saw the check engine lamp come on. The reason is because the XiEDs trick the Delphi ECM into richening up the fuel ratio. I expect to lose a bit of fuel mileage, but if I can keep running on regular,then there will be a big savings at the pump. I can feel no loss of power so far, but I did have premium in the tank and it mixed. Sorry for long post, but someone of you might have been thinking about this mod too. If they pass the proposed law in California requiring smog testing motorcycles, I will definitely have to pull the XiEDs off, but my pipes will have to be changed too and I threw my old ones away a couple years ago, along with the fuel tank vent canister that is on California models. That law better not cost, or there are going to a lot of unhappy campers in this state.