HI.

You can learn something new anytime, i thought 15psi was stage 1, until
i emailed karl norris of NORRIS MOTORSPORT, his stage 1+ will peak at 24psi
and held 18psi at 6000rpm dropping to 14. at 7000rpm, to cut a log story short its in the chip parameters, on yellow std injectors sierra cosworth. i was thinking
like everyone else based on map sensor ie 2,bar set up 15psi boost. karl
does his chips from scratch, where i think most tuners have a base file to start with.
Dave.