If mine hadn't growled and grumbled and occasionally farted loudly I would not have enjoyed it as much as I did. Like a hot rod car, it snarled on acceleration AND deceleration,, Not to say that there was not a time when an exhaust leak didn't have me embarrassed to ride with people. I hadn't found this place yet. And I don't have the brass to AntiSeize those skinny little bolts and torque them to 20 foot pounds like Verslagen..
So, Know it's not leaking first, then tune it to run as strong as it will, then, the notes it sings as it runs through it's range are just the machines sounds..a different exhaust will create a different sound. Finding one that doesn't choke the performance or create an obnoxious,raspy on the nerves kinda sound, Supertrap does that, but, they are expensive,, but they do build a short one that might fit the look you're after..

How high are you wanting it to go? Would your design invite rain into the pipe? Would that even matter if it did?

I don't pretend to have all the answers, but classmates in college Thanked me for asking the questions that helped them make A's.

Mine runs better on non-ethanol gas.
It's smoother, sounds better, doesn't make quite as much noise.  Hard to explain....it just feels better.  It also gets slightly better mileage.

I do like all the little burbles and pops and the nice bang after I shut it off.  Gives it character.