|
The sound of the touring comes from the design of the mufflers. Without completely redesigning the muffler ($$$) I don’t see how a NPP function can be added to their current systems. Even if they could, are people looking for a quieter system than it currently is with valves closed? You could always add dump valves just before the muffler to make it louder. If you want quieter than the touring axle back you may as well keep the stock NPP.
|