just installed new plugs. it took me two and a half hours following the write up on install university. I didn't have to take off the coil packs. # 6 was the hardest for me. #8 is really easy from underneath( i have skinny for arms). car seems smoother, but it could just be in my head. I gapped the new ngk- tr 55's at .058. I'm going to the track tomorrow to see if i can make any gains. weather should be perfect. trying to hit 12's.