13. For EFI setups Trask recommends the Zipper’s Thunder Max with Auto Tune. Trask prefers this system because of its extensive and in-depth tuning capabilities. Included is a CD with proper mapping to be loaded into Thunder Max. To go along with the Thunder Max is a two-bar map sensor (pictured). This two-bar map sensor reads boost pressure and feeds a signal to the Thunder Max so the system can add fuel or retard timing, and make adjustments as needed.