So, I have a new to me, very clean '09 JCW, serviced before I purchased, and under high boost, it dropped cylinders badly, pulled all 4 plugs, yup,NEW!!!! THEN checked the gaps.... Yah, .038 to.046....Hmmmm, blowing out da candles, gapped to .028, ALL BETTER!!!!! GEEZZZZ, well, goes to show ya, out of the box, in to the car.....techs now-a-days...... SET DA GA P!!!!!! LOL!!!!!