I know its not on a Banshee... but I have a set of both powdercoated, and ceramic pipe on my Raptor. I like the ceramic better, since you can buff it to get it nice and glossy again.
Ceramic-
Crappy pic of Powdercoat-
Find a crap ton of horses, and start out with 50 of them. Keep adding one horse until your quad won't pull them. The number of horses you pull is how much HP you've got.