That's crap. It depends on how rich the bike runs. I kept hearing slip-ons shouldn't produce popping on higher-RPM decel, and lemme tell you, I gots it, and gots it good. The tips carbon up only
if I don't pull the clutch and instead use engine braking, so I know this particular bike is running rich from the factory
(should pull the plugs at some point....). No, it's not air getting in, I've mounted the pipes three times, torqued the hell out of the clamps, etc., it's the bike (2016 in super-slick blue). I did buy the PAIR elimination kit and will put it in...sometime--probably in winter when the ECU can be sent in.
I've heard nothing but good about SLK pipes, and bet they have that chest-pounding *thud*...very tempting...in fact, almost bought a used set off the forum, but so happy with the slip-ons (from
which are right at the limit of "too loud") that I didn't. But I still might--that's how bad I want them.