The RUF 550hp RTurbo engine upgrade builds further off the 520hp package previously developed. Starting with all the details from the 520hp kit, they add additional horsepower through further modification of the turbochargers, and additional exhaust modifications for improved flow. With the new power levels, it is required that a new sport clutch gets added to the equation to cope. Contact us for a details estimate including installation. This particular kit is specific to Porsche 996 GT2 and 996TT X50.