Advice on parts please
 

Hi

I'm starting to build up some parts for my 2002 WRX and I want to fit them all at once and get it mapped at the same time. The question I have is what's parts should I fit. I'm only looking to get to 300 BHP.
So far I have got an STI up pipe, and bothe decat pipes for the exhaust. It has a prodrive back box fitted already so will stick with that for now.
I'm going to get a panel filter but not sure what to get, k&n, cosworth, any others to consider?
I will get a new Walbro and iridium plugs next but should I wait until I get pink injectors and a bigger turbo before I fit all the parts? Any advice will be helpful.

Cheers

:wonder: