Goodday.
If you look at earlier post on the Rocket touring part of this forum you can read about the aftermarket exhausts for the Touring untill your eyes fell out.
TORS ( Triumph After market)
Jardines ( the loudest)
D&D's
DAP performance ( Ebay UK) RVS
In most cases you need a new Tune for your engine.
Good Luck.
Hans (NL)
