Patent ID: 8388302

Claim:
A turbocharger assembly comprising: a. a low pressure (LP) turbocharger stage comprising a LP compressor ( 2 ) and a LP turbine ( 13 ) mechanically connected to the LP compressor; b. a high pressure (HP) turbocharger stage comprising a HP compressor ( 5 ) and a HP turbine ( 12 ) mechanically connected to the HP compressor; c. said LP compressor having a radial outlet and said HP compressor having an axial inlet and a compressor wheel adapted for being driven in a first direction of rotation, d. a conduit ( 7 ) providing fluid communication between the LP compressor outlet and the HP compressor inlet, wherein said LP turbocharger compressor has a volute shaped to produce a swirl in the airflow output from the LP compressor, the swirl having a direction of rotation that is opposite to the first direction of rotation of the compressor wheel of the HP compressor, wherein the swirl is propagated along the conduit such that the swirl arrives at the HP turbocharger compressor inlet in a direction of rotation that is opposite to the first direction of rotation of the compressor wheel of the HP compressor.