I'm having the garage checked out tomorrow. Then I'll have to work it out from there. :/
Worst comes to worst and I have to change would you suggest AUM or AUQ rather than Another ARZ?
Personally Id go for an AUM as they have the KO3s turbo like mine

AGU = 150 bhp - Throttle cable, KO3 turbo, 5 speed :- Re-maps to 185-200 bhp.
ARZ = 150 bhp - Drive-By-Wire, KO3 turbo, 5 speed. :- Re-maps to 185-200 bhp.
AUM = 150 bhp - D.B.W., VVT, KO3-S turbo, 5 speed :- Re-maps to 200-210 bhp.
AUQ = 180 bhp - D.B.W., VVT, KO3-S turbo, 6 speed :- Re-maps to 200-210 bhp.