The 5.7L Toyota Tundra is a very good truck right off  the showroom floor.  The Tundra’s power is rated at 381 hp and 401 lb·ft from the factory.  Toyota began selling a bolt-on TRD Supercharger kit for the 5.7-liter V8 Tundra during June 2008. Power output is increased to 504 hp (376 kW) and 550 pound-feet.  This TRD kit is …