lag reduction
 

Hi All,
have a wrx 4 which is pretty much starndard. only added an external fuel pump, aftermarket exhaust and AVCR.

i'm quite happy with the way the car is going right now. I run about 1.2 bar of boost. the only issue i have is the lag for the turbo to spool up. it comes up around 3500-4k.

what are the ways of reducing this lag time and getting the turbo to spool up quicker..