Alan Johnson Performance Engines, located in Santa Maria, California, manufactures performance heads for Harley Davidson application as well as high-performance cylinder heads for the professional drag racing engines. ESPRIT software is used in the machining process for the cylinder heads.

For 45 years the Johnson family has been involved in the drag racing industry.
The first competition the family ever attached its name to was in 1958 when Everett Johnson competed with his Blown Glass Pontiac at the Santa Maria Drag Strip. Today, they continue the tradition and are the 1997 and 1998 NHRA Winston Top Fuel Champions—and ESPRIT software continues to provide them the precision and performance to keep them in the winner’s circle.