I have a 2000 model manual VT S Pack and want more power?

I have a 2000 model VT S Pack in manual, it is running on 150kw, fitted is a 2.5inch catback exhaust, the flywheel and clutch kit has been changed to a heavy duty Exedy outfit, the tail shaft and uni joints have been replaced, my acceleration has improved and power is delivered even more than before but i want some more power but dont want to spend much. What can i do?