I just got the TEC x-pipe installed on my '23 SpeedMaster yesterday. I immediately noticed the low end throttle response improved (especially the torque assist feature) and the scooter is breathing better on the highway. I left the original mufflers on the scooter and it's a little louder, but the main thing I was going for was to get of heat from under the engine. Sitting at a long traffic light is a lot cooler now...
Cubix23