My SUV calls for dual electrode plugs but all the hype about Irridium plugs and Denso had a listing for my vehicle so I figured I would try them. I was not impressed in fact I went back to dual electrode with better results, much what side gapping would produce with my ride. As for high octane I can without a doubt tell a differnce when I added some 115 octane racing fuel. Just my seat of the pants opininion and with running 10.5 to 1 compression, I can use it!
