Autolite AR103-4PK High Performance Racing Resistor Spark Plug, Pack of 4

My car was detonating and going to a cooler plug fixed it, no need to run higher octane fuel no more.

Took the last set of these out after about 30,000 Miles and they didn't look terrible. I'll probably go with 20,000 mile change interval from now on with these though.

The spark plug is what I needed.. but 13.50 for ONE PLUG.. the picture shows 4 plugs.. and says PACK in the description .. (with “pack of one”in tiny print). Very deceptive and greedy, as I found the plugs at my local Advance Auto for 3.99 each. How about revising your advertising?

I ordered sparkplugs the picture showed 4 plugs I got one spark plug when I ordered the other three they all came separate REALLY

I usually use the A103 and gap to about .055. I tried these AR103's just for fun, in a Ford Focus 2.3 engine. I was told not to mess with the AR103 factory gap because of the unique design of this ground electrode. I did check the gap, but did not modify the gap. IIRC the gap on these is about .035 to .040. Car engine runs great with these AR103's.

DO NOT BUY the "1 pack" unless you only want 1 sparkplug. I purchased the "4 pack" expecting four individual packs containing 4 spark plugs each. I received 1 pack containing 4 spark plugs.

This did wonders for my mileage car. Feels faster....for a focus. HIGHLY RECOMMENDED

Excellent

Dyno proven to be the best plugs available for a Duratec, these run very well and won't melt the strap like hotter plugs if you're full bolt on.

Order these and you'll get the wrong ones in the mail, mistake at the warehouse.

Works great, car definitely feels more responsive.