I have a slight backfire in my bike coming from the front cylinder on decel only , it makes a light poof sound not a loud bang or popping . It started when I had the 103 stage 2 installed & the dealer said that when I had the bike dynoed it should be tuned out . It was getting around November & it was time for me to head out to Las Vegas for the winter so when I got to Vegas I went to HD dealer & had them do a custom mapp . The bike still made the slight poof noise , I took the bike back to the HD dealer that did the dyno & told them about the backfire , They took the bike back & said that they put it back on the dyno & said the bike runs to good to change anything , by the way I did change the exhaust crush gasket & it made no difference . I am used to it so it dont bother me much but a friend told me that I should try to get it taken care of because it could lead to engine damage . What would cause the noise was it the big bore install or is it fuel-air mixture problem ?