Copied from wikipedia
Engine choices available in the Tundra were a 24V 3.4-liter V6 engine that produced 190 horsepower (140 kW) and 220
lb·ft (298 N·m) of torque and an LEV certified 32 valve 4.7-liter "i-Force" V8 engine that produced 245 horsepower (183 kW) and 315 lb·ft (427 N·m) of torque. A
Toyota Racing Development (TRD) supercharger was already available for the 3.4-liter V6 (2000-2003 models) that bumped horsepower to the 260 horsepower (190 kW) range and 260 lb·ft (350 N·m) of torque. TRD introduced a second supercharger for the V8 (2000-2003 models) engine late into its second year of production that pushed the V8 numbers to the mid 300 horsepower (220 kW) range and torque to the 400 lb·ft (540 N·m) range. Although the V6 supercharger is still widely available, the V8 supercharger is rarer and harder to find because TRD stopped its production once Toyota released the updated
VVT-i equipped 4.7-liter engine.