I don't believe standard injectors can keep up with 20 psi. I run 19 psi peak on T3 and I have Bosch greens. Cosworth standard injectors on Stage 1 usually see maximum of 15 psi. On Stage 2, as said, you need Bosch 803 (green) injectors, 3 bar MAP sensor, -31 actuator and for extra security, stronger head gasket.
I wouldn't risk running 20 psi boost with standard injectors, you might get the mixture too lean and blow up the engine. Fit greens and required chip for it to be safe!
Last edited by Cossie92; 28-04-2012 at 04:01 PM.