ok since you already have the B16a "built for boost" if that includes rods and pistons then you can safely run 12 psi all day without cracking a sleeve, most likely even more boost than that if the pistons are lower C/R than stock... and with that setup you could easily put down 260-280 to the wheels... and as far as you spending $900 on a manifold setup... thats ****ing insane... you can find a manifold on ebay for as cheap as $75 ... and with the downpipe maybe another $125... the setup will not blow if you don't turn up the boost... and tuning is key... buy a cheap manifold and use the left over money to get your **** tuned....