Just did a Varex muffler install on dotdot's GC8. Results were awesome. Full flow when Varex's muffler plate was open and factory quiet when muffler plate was closed. All this happened with the simple operation via a remote controller.

Below are pics of the Varex full stainless muffler installed onto his existing 3" system.

Varex open (boxer rumble):


Varex closed (factory quiet)


Varex tip:


Proper flange fitment:


Finished product angled out (sorry for the poor pic):