Originally Posted by rjd598
The rpi gtm which is full catless I heard drones too. Op is talking about gtc which is a quieter muffler with the same xpipe as the gtm. I think rpi claims less drone or none at all with the gtc. The whole point was to tone the gtm down with the gtc muffler
the GTC has much less drone compared to the GTM. in general the GTC is about 30% quieter than the GTM.