If you are looking to make modifications to your Banshee I would recommend this site mobiledyno.com. Anyone familiar with these guys?
Another forum site out there is bansheehq.com.

 

www.quadstore.com I think it's the same as mobiledyno.
Don't forget www.bansheeboyz.com . It's under construction, but they have pics (of me on the front page, the guy wheelying...that's me ), videos (action and funny wrecks)...it's pretty cool.
If you're advanced (mechanically), check out also www.macdizzy.com. The guys there are real bright...or have lots of free time to think. I undrstand 2/3 of the posts...others are "I'll read this later..."