Well, as long as the exhaust has been done then you are safe with OD pulley, overdrives blower so it will produce higher boost and force more air in. I would just go with a 10% and get all the power you can. The underdrive pulleys reduce parasitic loss to accessories, they have been said to give .1 - .15 in quarter mile alone. The IC is a big expense and there should be other things done before you get into the big buck items. You can also remove the air silencer for free, good for 5 hp or so, it is in passenger side fender well under air filter box. Then you can look into TB to let more air in. Everything that I listed can be easily done yourself too.