stock boost gauge reads around .85bar, so its like 12psi? wrx is supposed to be 10.5psi stock, but who knows. getting it to 15psi is really my goal. i already got a 3" down, i just need to get a box of 3" pipe and make the rest of the exhaust.

 

Do you already have a up pipe? Im pretty sure i still have one from work, I did a UVI on a wrx and had to remove it and put a stock one back on.

 

i missed a chance at an sti uppipe. lemme know what subie goodies you and slo have

 

a fishtank valve is a plastic needle valve. $.75 hmt mbc...

 

Don't bother with the STi up-pipe if it still has a cat section in the middle. Ebay has tons of cheap up-pipes that'll do the job just fine. Trick to keeping them from leaking and breaking after a while is you have to unbolt all the brackets attaching the turbo to the motor. Once you've got them loose you can put the up-pipe in and after that re-attach the brackets and torque them down. Also would be a good idea to unbolt the motor mounts and jack the motor up a hair to give some better access for that up-pipe...you'll see what I'm talking about when you get under there lol.
I don't know about your stock gauge, but my stock gauge reads in MPa...not bar. When mine was stock it usually swung just a hair over .1 MPa (.1MPa is almost 1 bar) on my '04, or around 15psi. I'd just get a different gauge that reads in psi or whatever you're comfortable with (I'm getting quite comfy with kPa lately lol) just to make sure. And dollar for dollar, you'll probably be better off getting a cheap ebay 3" exhaust too that should fit with no major issues. Making exhausts is a pita these days lol.

 

interesting, learn something new everyday.