Ya ive got 130k on mine and dont know if PO ever changed out the plugs. Doing this in a few days, from a few different threads seems like ill be impressed with how much netter it drives. Who knows how far off mine are
1998 Jeep Wrangler, 4.0 I6
33x12.50 Goodyear Wrangler Duratracs
3 inch Zone suspension lift, Rubicon Express adjustable front track bar, 1.25 inch body lift.