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NGK, i run them in everything from my motocross racers to my daily drivers... i've had autolites porcelein crack more than once and fall down into the cylinder...
Autolite 3923s are the only ones I use. Paying 100$ for spark plugs is ridiculous and if someone is willing to pay that they are ridiculous too, and a sucker make sure they are bling bling when u take them out gold plated with diamond tips.