I have 76 mm pistons , god knows what it = too the machine shop told me would be much 😞 But they wouldnt warranty the engine if i didnt get forged ones.
Depends what mods, you can have a map done by OCD (by rottelle racing) suited for g40 injectors 190-200cc on here people reckon they will happily take up to 160bhp.
OCD ones are for tubo set up 315cc , i have posted in every vag forum going havernt had owt yet.