The phrase "twin turbochargers" means that there are two turbochargers working together to increase the power and performance of an engine. Full definition
It included a 3.7 L V6 gasoline engine with twin turbochargers rated 440 PS (320 kW; 430 hp), an electric motor (called 3D Motor) rated 160 PS (120 kW; 160 hp) and 500 N ⋅ m (370 lb ⋅ ft), with a combined rating of 600 PS (440 kW; 590 hp). (en.wikipedia.org)
The 3.5 - liter V6 found under the hood of the Taurus SHO makes use of twin turbochargers in order to generate 365 ponies and 350 lb - ft of torque. (autobytel.com)
A completely new developed all - aluminium V8 - engine, boosted by twin turbochargers had been developed in conjunction with BMW (Bavarian Motor Works, Munich). (rrab.com)