Any name brand plug will run well. Splitfires have been proven over and over to have a initial short term gain then they gap out and need to be re-gapped to get the performance back, usually about every 5K. They also give best performance in LARGE piston installs, Bikes with over 600 CC jugs, Big block trucks etc. Any standard plug can be gapped wider to raise heat in the spark, but you give up High rpm stability. its a tight balance. I personally run the NGK's because that's what teh clever engineer that designed my engine put in it originally... At least according to my owners manual. Dave __________________ Dave - PDX 1995 318ti - Active Black and Tan. 2005 330xi - Mtech 1 - 6spd - Orient Blue/Black |