Oettinger stage two does match your stage two, but i noticed that oettinger used bigger injectors
And has you say Oettinger have one of the best reputations!
I guess butting bigger injectors, just stops smaller injectors been stressing past there design tolerance.
Either way both should do the same job at around 233 bhp
Here are K04-15 Dynos with miltek exhaust.
Bubstar setup still runing KO3S/TIP/remap.
i guess the above thread confirms, that you olny gain around 9 HP extra by adding a K04-15 on the 190bhp.
But you do get an extra 30 ft-lb of tq which i guess is not to be sniffed at.
I know a guy how told jimbo at awesome, that the APR Ko4 kit was a waste of time, because of the small HP gains upgrading from k03s.
Jimbo then give him a test drive in a clients octavia VRS with the ko4 kit on.
The guy soon changed his mind when he felt the torque kicking in early.