Dave,

I'm affraid I only advise the use of mapped amal/air injectors as it prevents the user from altering the boost himself. People being the way they are often can't help themsleves in adjusting the boost, especially if they have in car adjusters, and thats why I really don't advise any in car form of adjustment, UNLESS its a properly mapped in car adjustment such as for air injector control.

Anything that gives the user adjustment is recipe for disaster. After you car has been mapped and setup, it should not be adjusted without seeking advice from your tuner!

(This advice is given after all the years of hearing "I only tweaked the bleed vlave a bit, honest")