K03 stage 2+ is pointless. Why not just stick on a K04 turbo on with a custom remap and have the equivalent of a stage 1 Ed30 for a 1/3 of the price running less boost less heat and more power.
Alternately, stage 1+ seems to give very very good results, and all that needs is a HPFP. That will give you the same figures as a stage 2 car but again, at less cost.