Yep, im no expert but after several months of R&D and listening to the fellas that made my pipes, what hanso said is spot on.
Also sound wise, tuning sound and getting it deeper, louder is all about pipe width, length baffling and what it is packed with etc etc etc.
If you're after a few ****s and giggles, rip the whole thing off and take it for a fang. make sure it is on a dark night and get it on film. select a gear higher than you should and load her up as revs pick up back her off and watch the fireworks. It's a bloody stupid thing to do, but is lots of fun to watch.
Especially when you are riding around the yarra boulevard on a 1098 Ducati that you are doing it on, no fairings, no exhaust and trying to blow her up the night before you're installing a new engine..the runners on the running track along the side of road became great high jumpers as you let her pop just as you're screaming past!
Did i ever mention I was young and flaming stupid mad once upon a time. Now i have less hair.