Of course you want to look good, to sound good and to go faster. You don’t necessarily need to trade your engine, just upgrade it. Of course S&S Cycle would like to sell you one of his engines. But if you got the itch for more performance and a new engine is not right now in your budget, their website lists some tricks to improve your existing motor.
Displacement tricks up to 70 HP. Replacement tricks up to 30 HP. And a line of bolt-on parts adding up to 10 HP. It’s up to you and your budget. See them listed at S&S Cycle.