Hey guys, I 've ran through a lot of similar posts on this issue but still can't seem to get a clear picture so would really appreciate any help or directions to another thread. During the summer i changed the pipes on my 2008 crossbones for vance and hines big shot with quiet baffles. I used a fuelpak and k&n racing filter as suggested by the dealer. I wasn't very happy with the performance at first, too much popping on decel and the bike was running very rich so contacted vance and hines and remapped the fuelpak with the new settings. Unfortunately it did not really do much to improve the performance.I thought about getting a pciii but on their site it says it is not suitable for the crossbones. IN the middle of this i purchased a brawler seat seat for the bike and found out that there was not enough space for the fuelpak. We removed the fuelpak just so i could test the seat and found that the bike ran a lot better, hardly any popping and a reasonable turnover at idling. Now i read in another post on this forum that running the bike without the fuelpak would not be the cleverest idea though i'm not sure why. Any ideas on this?