 This remained the only offering from Steeda through the 2002 model year.In 2003 Steeda introduced the Q400, based on the Mustang GT with an advertised 400 hp (298 kW).The 4.6L V8 in the Q400 was modified with a Vortech (or Paxton) centrifugal supercharger, K&N Filter, Ford Racing Performance Parts (FRPP)70 mm throttle body, and an HD aluminum radiator.