I own a Classic 500 Euro 3. It has an AEW Goldstar aftermarket exhaust installed on it. I recently got its throttle body cleaned at a FNG. After doing that, whenever I ride the bike, it gives out a loud (read thundering) pop almost every time when I let go of the throttle or use up the entire rev band. It did not have such a problem before aside the occasional pops which weren't as deafening as these. What might be the problem? Will installing a DB killer to the exhaust help in any way?