On a 04 model wrx

Already have green panel filter fitted,

im just after a 5 or 10 bhp gain, so dont want to spend tek map money etc

many thanks, i know its a hard one the bhp and money ltd (:

otherwise

tek map
up pipe
fuel pump

 

Dawes Device? to turn up the boost, thats all I can suggest at the moment.

 

Improve the suspension to make better use of the adequate power that's there. That's what I've done, and I've found it much more worthwhile than a barely perceivable power increase.

 

already done eibachs and red stuff pads

and sti covers without stickers for aero dynamics

 

intercooler splitter ?

 

H & S Downpipe

Did wonders for mine - let it breath more easily

eliot

 

Seen a few Sti PPP downpipes FS on here recently if you didn't want to go down a full decat route.
Mixed opinions on if you need a remap afterwards to avoid overboosting..