I bought my 2006 Fatboy Flstfi in 2008 when i got it it already had Screamin Eagle slip ons and a Vance and Hines fuel pack. After riding in front of others and being told that my bike smelled like it was running to rich and noticing the exhaust was really black at the tips I had my local H-D Dealer have a look. They removed the fuel pack and checked the mapp sensor and told me the fuel pack was the problem. It is my understanding though that that fuel pack can be programmed on a stock bike. My concern is after riding for approx. 2500miles now without the fuelpack installed and the slip ons still on it, the header pipe is now yellow/gold color all the way to the mufflers. Does this sound like maybe it is to lean? The air cleaner is stock. Also I am about to purchase new pipes and a better flowing air cleaner for this bike. My considerations are Sampson Big Guns 3 Pomona staggered and a K&N filter with the stock air cleaner cover. Any input on the current symptoms and my choice for new pipes and air cleaner are appreciated. Btw I still have the fuel pack and intend to use it when pipes and air cleaner are installed.