Originally Posted by mshab356
If the drone is the issue, I've heard RPi's exhaust drones like crazy. I love my Active Autowerke exhaust. Very unique low growl/high pitch exotic sound and barely any drone!
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