Pop on decel

Hey guys 09 450 and it pops on decel it's got a full fmf exhaust I know it's getting air some where could it be or is that just how they are

If it's tuned right, it should pop. Not all the time, just crackle a little sometimes.  But if it's excessive and you have an FMF pipe, I'd check the pipe before I fiddled with the carb.   They usually use a spring-seated header, and that joint wears during use and can leak too much.  The mid pipe is held into quite a few of them the same way, and the joint in the middle can leak, too. 

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