does anyone know if this is upgradable in the a3? my dealer said this engine on the 2006's have the diverter valve built in with the turbo and not upgradable.

 

Why do you want to upgrade? Are you chipped? There aren't any problems with the new DV's holding boost yet. And yes they are integrated, but are replacable. I forget which company (greedspeed?) but one of the tuners has a BOV available. Those are bad anyway though.