[ra24man]

With all the 'gimmick' spark plugs to hit the market with in the last 15 years (Splitfire, Bosch Plus Four) I remain skeptical as well. I would love to see some independent dyno testing done before I'd be sold. But than the whole forced induction thing comes into play. I've got a customer that seems to have noticed a dramatic change in his 3SGTE powered MR2, but I've never put much faith in my butt dyno let alone someone else's. I find copper works well...and I only drive my Supra enough to warrant replacing the plugs once a year at best.