John Fitzpatrick bought the car from Kremer for the 1982 IMSA season, and his team of Glen Blakely and Max Crawford immediately set to work on upgrading and modifying the car. They built a completely new body with in-door air ducts for the intercoolers, and also designed a new rear suspension and belly pans. Mechanically the K4 continued to develop the tried-and-true 935 turbo motor by using enhanced air-to-air intercoolers and ducting resulting in a 50 horsepower advantage over other 935s. With the boost fully turned up the car was capable of producing well over 800 horsepower. The result of all of this work was FIVE WINS and only one DNF in 1982. In 1983 the car raced only twice, with another win at Riverside. In 1984 the K4 was rented to Al Holbert for three races, which saw the switch to Holbert's #14 and Lowenbrau livery.
