Wow I got timed out. (new to this forum) So I guess I gotta make it shorter.
No there is no good aftermarket stuff out there and what little there is is usually for SHO's. So..Here's some things you can do.
1: Buy a Hi-flow panel filter (usually K&N) for about $40 - $50 and drop it in. Your Bull already has a pretty decent factory CAI. Just not very flowing.
2: Pull off the silencer on the intake going to the front (along the fenderwell) this will free up a little more air, and give you a little growl.
ull off the whole intake pipe from the airbox up to the front and just run a short piece of 3 or 4" snorkel from the stock airbox into the fenderwell. *note: the stock airbox isolates the filter from heat very well
These are the cheapest and probably most efficient setups you can make for maybe +4 to +10 hp depending.