a set of NGK iridium plugs gapped at .032. I replaced the stock 8MM motorsport blue wires and Motorsport Plugs. I didn't think there was going to be much difference, but it is a VERY noticeable difference. The car idles better and "feels" like it has more power at WOT. I originally bought them to handle the Kenne Bell B-A-S, not to improve idle. I am pleasantly surprised.