My head pipes still have cats in them. My bike came w/these mufflers on it. They are basically straight thru, but have aggressive raised baffle /tabs inside. Supprized they are not louder. No tuner, stock air cleaner. The bike runs well enough but has very slight exhaust popping. Plugs look ok. If I install DK torque insert ( wavy lollipop) to help the reversion issue-I read this should bring a little more torque back to the engine. Was told these will help slightly richen up the mixture by creating some back pressure-or prevent reversion . Anyone have personal experiences with these ? Or a similar set up using these inserts ? Thanks for you replies.