How to get more BHP out of the ECUtek remap
 

I am thinking to get my 53 reg STi book in for a remap with Simon @ Jolly green monster.. but

I currently done most of the bolt on mod like Turbo back exhaust. HKS panel filter, uprated fuel pump. I understand I am looking at a range of 320-330ish?

are there anything else i can do at the mean while to get it up to around 350ish without anything too complicated? any advice would be appreciated. thanks

If you're thinking of using JGM, then why not speak to him about it, and see what he sugests?