Just recently got a RJWC exhaust installed on my 950 and fuel tuner from attitude industries and when Im going high rpms and I de accelerate it makes one pop noise and Im just concerned is it normal part of the exhaust or should I be concerned ?I ve never owned a sxs or let alone had a after market exhaust before this is all new to me I also dont lose power or anything it just makes a pop noise like a fire cracker when I let off the pedal at high rpms 

[2015 Z Force 800 53/Trail EPS]

Aftermarket exhausts most often reduces back pressure which causes leaning which causes popping in the exhaust on decel. That's why it needs richened back up with programmers. Sometimes it isn't enough and they need a little more. More often however there is an exhaust leak somewhere..which also causes popping on decel.