99 SSEI Maxed

I'm looking pump up the HPs on my Bonnie w/new pully, air filter, and minimal extras. If I'm at 245Hp now, what is a reasonable expectation that will still allow me to drive the car to and from the office? 275? 290? 325?

i'd say at best u'd get 5-10 for a new aftermarket airfilter and maybe 10 for new pully