Connection and sound attenuation system for intake line of a turbocharged engine, and said inlet line.

The system (1) has a flexible hose (2) connected to an intake line. A non-metallic sound attenuation device (10) is attached to an outlet flange (3) of an outdoor turbocharger. A pipe is radially clamped by the hose for forming acoustic chambers (C1, C2). Two parts (11, 12) are secured to one another by a clipping, where one of the parts is provided with a fastening unit (4) for fastening the part to the flange, and the other part defines one of chambers with the former part.