I used to always have a 4" dia K&N filter clamped right to the inlet of the novi1000. Well I bought some parts on ebay to rig up a FWI:
4"-3.5" silicone reducer
3.5"-3" silicone elbow
3.5" polished aluminum pipe
3" 45-degree aluminum pipe
T-bolt clamps
cone filter from autozone (my 9" long K&N doesn't fit)

Took an hour and a half to cut the metal and rig everything up. It is really tight where the elbow is going down into the fenderwell.
Took it for a drive and didn't notice much difference, but the engine wasn't heat-soaked yet. I think it sounds a little smoother on the screaming top end though.










Rook.. if you read this... how is that $25 "power-adder" cone filter from autozone? It seems comparable to a K&N. I had to buy it last minute cause thats all that fit the pipe I had. Didn't have room for my adapter rig to fit my 9" filter in there.