Probably get away with a 3.5 pulley. You should get a bigger downpipe or go with headers though.

For the intake, either get a CAI or just stick a filter right off of the LQ4 maf. Its restriction vs. air temps. and when you have a supercharger the temp. is going to rise either way, so don't lose sleep over going one way or the other. Gutting the stock airbox probably wouldn't be the ideal solution.