I have a 2001 lexus es 300, is there any way i can get more power out of this thing

With the smog laws the way that they are, your better off leaving it alone

Change the air filter with a K&N one.

Yes, first way - compressor.
Second simply tune the car ''brains'' - chip tuning
Third - change stuff like air filter, exhaust pipes.

But honestly, leave Lexus as it is Lexus is a cool not racing car. If you want to race by Subaru)

Yes there are all kinds of way you can get power out of that car. Small things like cold air intake, exhaust (cat back), computer chip and tune the car and you could get your head, port and polished. Each of this things will only give you a little HP
go to Streetfire.net, talk to the lexus guys on that site and you can see what they have done with their cars.