[TOPEC]

^ just step on the accelerate pedal harder to build boost? once boost target is hit, wastegate opens up. if there was a way to manually open the wastegate on demand, u'll have serious turbo lag when trying to accelerate... which is pretty dumb... and no, cold start does not open up the wastegate to bypass the turbine to warm up the cats quicker. the wastesgate is normally opened until u accelerate, so either way majority of the gas is bypassing the turbine already. the louder exhaust during cold start is due to a) the exhaust flap opening and b) the higher engine idle speed.