2001 Ford Mustang Bullitt Transmission Swap - 50-Caliber Automatic - Tech

"The automatic eliminated this 'compromise' I made between strip and street performance with the heavy-duty clutch. It has totally changed the personality of the car for the better. I've yet to find a downside to this conversion."

We did find out later that SLP Performance Parts in Toms River, New Jersey, also sells long-tube headers that fit the automatic application, though they are available only with a 151/48-inch primary tube. Both companies utilize stainless steel for header construction, and Kooks Headers offers both 151/48- and 131/44-inch tubes, the latter of which was far more applicable for our horsepower level here.

A job like this is not an easy task, by any means, and should be attempted only by a professional as it requires quite a bit of labor, wiring knowledge, and ECM programming to make it all work. The results may be worth it, however, if your Bullitt (Mustang GT or Cobra) has trouble getting those ponies to the pavement.