Are you referring to active fuel management (AFM)?
This is when your engine switches into 4 cylinder mode.
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Ordered: 10-13-08
Built: 3-30-09 (#1691)
Recieved: 6-12-09
Blacked out, Cammed (Lunati Voodoo 233/245, .578/.598 @114°, +4°), ARH LTs, VR OTR CAI, Cutouts, and lots of other fun mods.
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