Calibration Proms & Mem-Cals

*All calibration proms purchased without a Howell Engine Development harness are $200.00 to $250.00 price range.

**Calibration Proms listed by part number are priced as if purchased with a Howell Engine Developments harness (Not for individual sale).

***Custom Calibration proms should be ordered by phone do to the specific parameters involved.