I posted this at CRFsOnly, but figured that some people here might be interested as well. --------------------------------- I have my 250X with the following mods: CCC airbox, screen removed JD Jet kit, 165/42/red on 5th clip Heavy O-Ring fuel screw 3/4 turn out I have a stock exhaust that has the diffuser removed, and I just got a brand new 250R exhaust system. I am going to Marietta Motorsports tomorrow, and I will try different combinations with the two headers and two cans I have, as well as the pink wire on and off. This shop is run by Craig "Huey" Stewart and Chris "Opie" Caylor, both having a long career in racing and tuning for various AMA teams. They do great work, and Huey is going to give me some dyno time and we will see what pipe or combination of pipes works best And we will see if the pink wire makes more or less power, both in peak power, but also in power per unit of time. I will post up the dyno charts and all the results tomorrow night. Part Deux: Ok, the results are in! My tuner forgot to email me the dyno charts, but I will post them up later. We had two 250X's on the dyno today. Huey's is a 2007 250X, but it has the full CCC mod done to it per Honda's instruction. One thing that differs, is that he has a prototype M4 full exhaust race kit on it instead of the 250R pipe. My 250X's specs are above, but we found that it was running a tad rich, so we moved the red needle from the 5th clip to the 4th and that made the motor happier. I found that my bike made more power everywhere with the R exhaust kit, compared to the modded stock X system and the X header/R can combo. Once we got the best setup for each bike, we did back to back dyno runs with the pink wire on and off. First off, Huey's bike made 3HP more than mine on top due to the R cam, while mine made 2HP more through a good chunk of the mid-range. But when we did the pink wire mod to each bike, each bike made about 2HP more in the 10-12k RPM range. When you see the dyno charts(as soon as he remembers to email them to me), it is very clear that the pink wire does more than just increase the rev-limiter, because the extra power is being made in the 10-12k range, and not the 12-23k range that the rev-limiter extends. So there is a definite increase from timing or something else, and it had the same proportional increase with both the stock X cam and the R cam. I will post up the dyno charts as soon as I get them.