What is K04 upgrade?
This turbo kit allows you to run a Stage 2+ and Stage 3 tune in your Audi or Volkswagen. With the K04 turbo kit and the Stage 2+ tune, you will bump up your car from its stock 200 Wheel Torque/194 Wheel Horsepower to 340 Wheel Torque/312 Wheel Horsepower. The K04 Turbo Kit is made by several companies.
How good is the K04 turbo?
Overall this turbo is great, spools fast, sounds mean (I have a silicone turbo inlet pipe and cone filter with heat shield) and makes full boost (8psi) on a stock ko3 program. So YES you can swap this turbo in and run it on a stock tune but a k04 tune and supporting mods would be way better.
How much HP does a K04 turbo add?
Using 98-octane fuel, the APR K04 Turbocharger System produces an astonishing 348 horsepower and 342 ft-lbs of torque.