Are they the same but just flipped around, i.e. have they got the same flow rate. Asking as after talking to cr turbos they said that a k04 turbo hybrided would give figures of 330bhp-340bhp if on a ko4 manifold whilst the k03s hybrid 280bhp-300bhp. You can get a k04 from backdraft thats a direct replacement, fitting onto the a3 manifold. If they are the same then couldnt I uin theory get 320bhp+ on my a3, but these figures seem pretty high.