Pricing for the latter and the 1,500-whp kit is not publicly available, but Underground Racing does list 175,000 dollars installed for the so-called Stage 3 PLUS twin-turbo system. In this context ...

With 389 hp and 479 lb-ft of torque, the Toyota Tundra's 3.5-liter twin-turbo i-Force ... you covered with a factory installed TRD Performance Package, and the kit looks to wake up Toyota's ...