Speak to Collin at Greers for a exedy organic clutch , comes in at a good price and can take a beeting. Stay with your original airbox as it is more than capable at runing the power you will be getting. You will also need to fit the 255 fuel pump and i would recomend a set of sti pink injectors(550cc) Oh and put a sti panel filter in the airbox.
Remember i was runing 334bhp and 330flbt and i had all of the above, including the plug that Wilky was on about.
Good luck.
Higgy