to get power? if it is in stock form you could try taking off the top portion of your airbox. you would get a "cooler" sound but your gas milage would suffer. so that would cost money. you could also try taking off your ac belt and or power steering belt. that would free up the crank for a little more power. i really dont know how much power this would free up but you would feel a slight diffrence.
to make your car a little bit faster you could do lighter rims, smaller tires/rims (for gear ratio change), and lightening up your car by taking out your spare tire, sound dedening material, dont fill up your gas tank so full, take out some interior and stuff like that. with all of this we are talking about miminal changes in acceleration. but you ask for 10-30 more. horespower isnt everything. "they" say every 100 pounds is a tenth quicker in the 1/4 mile. dont know if that is true...