NGK race spark plugs

If you’re running high boost, these are the plugs to have. They don’t have an internal resistor so 100% of the spark energy goes into the arc. We’ve seen these solve high-boost misfire problems on 400 hp cars. You’ll be able to run a bigger gap, which means a bigger spark and more power. It’s the cheapest ignition upgrade you can get.

What’s the downside? In theory, more ignition noise in your stereo. We haven’t actually experienced that nor have we received any reports of problems from our customers. But you have been warned. You might also get a little burble at idle. These are a heat range 7 which is great for high power, but are going to be more prone to fouling if the car has starting problems. We used to run #7 plugs in all our turbo cars until a few years ago.

Should you use anti-seize? Short answer, not on these. Here’s the longer answer, straight from NGK: “NGK spark plugs feature trivalent plating. This silver or chrome-colored finish on the threads is designed to provide corrosion resistance against moisture and chemicals. The coating also acts as a release agent during spark plug removal. NGK spark plugs are installed at the factory dry, without lubrication or anti-seize.” 

For 1990-05 Miatas. Works well in conjunction with our Big Spark kit. Not compatible with the old Link ECU. Sold in sets of four – that’s enough for one full car.

NGK R5671A-7