I just bought a C&L MAF for #3651. The fellow at C&L was very helpful. I told him about our club and he was unaware of it. He offered me a discount and free shipping when I asked if he could give us a discount. I told him we have about 1000 members and many, if not most of us are modifying our vehicles. He said that he could do a group buy if we liked if someone would want to set such a thing up. He is sending me 2 different calibrations. One is the stock calibration the other is a leaner calibration since he claims that the few Bullitt owners he has talked to seem to think the Bullitt comes from the factory a bit rich in fuel/air mixture. He has asked me to try the leaner calibration and to see if I get a check engine light. If not then this will give more HP than stock calibration. Once I get the thing installed (should be in a couple weeks) I will give you my SOTP impression. He has asked me to get back with him as to whether this leaner setting works without giving a check engine light. If it does the stock calibration will work fine he said.