ok yes you do use both cams both cams will be better on the 2.4 asked a guy who has done 12 swaps... the nipple cutting thing is on the intake cam the exhaust has no cam magnet... origanally before they found out that you had to cut the nipple and rotate 90* they only noticed a gain out of the exaust cam seeing they couldent figure out why the intake cam wouldent work...