WOW this post will take a while cuz i see tons of comments that arent true

so lets begin

a normal k03 will not run 21psi ever cuz its not effective in this range

no you cant find a gti 1.8t for 9k unless it has been banged to hell and back they are just to popular right now

as stated by my amigo 1.8t's dont have more potential cuz no one has one making over 500whp to date secondly

lastly my 97 2.0 8v is faster than you focus sorry but they arent fast and you know that but i dont think a chipped 1.8t will run down a 350z

now i think for the money you are wanting to spend you should find a used mk3 vr6 95-mid99 gti you can find them for around 6k chip/e/i/and cam will work wonders and you that will bring you around the 9k mark and you should then be running down 350's