Ducting (200, 300, 400, 600) for use with: a high pressure turbocharger (412, 612) having: a HPT exhaust gas outlet, a rotor with a rotor axis, and a wastegate adapted to selectively bypass the HPT; and a low pressure turbocharger 2. having an LPT exhaust gas inlet wherein the ducting comprises: a first duct (216, 316, 416, 616) having a first duct inlet (220, 320, 420) connectable to the HPT exhaust gas outlet and a first duct outlet 2. (222, 322, 422) connectable to the LPT exhaust gas inlet; and a second duct (218, 318, 418, 618) having a second duct inlet (226, 326, 426) for wastegate gases from the wastegate of the HPT and a second duct outlet (228, 328, 428, 628) located within the first duct wherein the second duct comprises an elongate second duct portion (229, 329, 429) which is a length of the second duct located within the first duct, the second duct portion comprising the second duct outlet and being arranged such that the second duct outlet is pointed towards the first duct outlet, wherein the first duct has a length extending from the first duct inlet to the first duct outlet, characterized in that the second duct is arranged such that the second duct outlet is positioned along the length at a distance in the range of 0.01L to 0.3L away from the first duct outlet a high pressure turbocharger (412, 612) having: a HPT exhaust gas outlet, a rotor with a rotor axis, and a wastegate adapted to selectively bypass the HPT; and a HPT exhaust gas outlet, a rotor with a rotor axis, and a wastegate adapted to selectively bypass the HPT; and a low pressure turbocharger 2. having an LPT exhaust gas inlet wherein the ducting comprises: a first duct (216, 316, 416, 616) having a first duct inlet (220, 320, 420) connectable to the HPT exhaust gas outlet and a first duct outlet 2. (222, 322, 422) connectable to the LPT exhaust gas inlet; and a second duct (218, 318, 418, 618) having a second duct inlet (226, 326, 426) for wastegate gases from the wastegate of the HPT and a second duct outlet (228, 328, 428, 628) located within the first duct wherein the second duct comprises an elongate second duct portion (229, 329, 429) which is a length of the second duct located within the first duct, the second duct portion comprising the second duct outlet and being arranged such that the second duct outlet is pointed towards the first duct outlet, wherein the first duct has a length extending from the first duct inlet to the first duct outlet, characterized in that the second duct is arranged such that the second duct outlet is positioned along the length at a distance in the range of 0.01L to 0.3L away from the first duct outlet a first duct (216, 316, 416, 616) having a first duct inlet (220, 320, 420) connectable to the HPT exhaust gas outlet and a first duct outlet 2. (222, 322, 422) connectable to the LPT exhaust gas inlet; and a second duct (218, 318, 418, 618) having a second duct inlet (226, 326, 426) for wastegate gases from the wastegate of the HPT and a second duct outlet (228, 328, 428, 628) located within the first duct wherein the second duct comprises an elongate second duct portion (229, 329, 429) which is a length of the second duct located within the first duct, the second duct portion comprising the second duct outlet and being arranged such that the second duct outlet is pointed towards the first duct outlet, wherein the first duct has a length extending from the first duct inlet to the first duct outlet, characterized in that the second duct is arranged such that the second duct outlet is positioned along the length at a distance in the range of 0.01L to 0.3L away from the first duct outlet