More difficult than a stock standard run of the mill tune, but highly doable.
We'll soon find since Turboknapp has a set of bumpity bump sticks ready to go into the blue meanie.
BA Non FPV have a set offset between the intake and exhaust cam.
BF and FG have dual VCT so cam position relative to each other can be changed in relations to each out (ie overlap)
Technically it's Exhaust Cam position relative to Intake.