I know things... A lot of things.
Join Date: Feb 2015
Motorcycle: GSXR 750 K4
Re: Exhaust popping on decel?
Removing the SET valve is likely to affect the volumetric efficiency of the engine. Whether this will disrupt fueling enough to allow unburnt fuel to collect in the exhaust and cause popping I can't predict, but you might try to simply disconnect it for a while and make sure it's kept open somehow. Although this won't have the same effect as removing it altogether, it should be close enough, giving you an idea of the effects you should expect.
You should not interpret my suggestion as endorsing the idea of removing the SET valve by the way. As far as I can tell, you'd just be disabling a well-engineered component of your engine, which only adds to its sophistication, likely on dubious grounds.