I have a 2004 FLHRSI, recently changed the stock slip on muffs for the Vance & Hines variety. Took it to the dealer for an inspection. He said it was running a "little lean" but not enough for a remap and download. Now when I decel between low gear changes I get a slight to moderate pop. Other wise torque and horsepower seemed to have improved. I have always been under the impression that pops come from being too rich, and not too lean. Is that a correct frame of thinking? In the mean time, I am considering ordering a set of Big City Thunder baffles to richen the mixture back up a little bit and add the extra torque and HP that the manufacturer claims. Has any one used these and what are the true effects? The Q&A guy at Big City thunder claims that installing a set of these in the end of the head pipes will give the efi a proper read again, which is also my thoughts as well. Just would like some more info before I drill my head pipes to accept the set screws to accept the new baffles. Do I sound baffled?