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My understanding is the extender only works from 4000rpm & up. Also make sure to turn off the car prior to making adjustments.

8 & 8 will give you 12.25:1 and an 8100rpm limit. You must be running a prostock engine? RPM 0=6500 1=6700 2=6900 etc AF 3=11:1 4=11.25:1 5=11.50:1 6=11.75:1 7=12:00:1 etc email me at [email protected] if you would like the full tables.