actually,i heard that 3 electrodes were the optimum number.it helps to "triangulate the spark" and allows the muffler bearings to spin counterclockwise as designed.:devil:I have a firefighter buddy who ran one after his co-workers said they were miracle workers......what a crock. On a round air cleaner, I could possibly see something happening to the airflow, but on a late model injected vehicle where that little tiny thing is stuck the airbox a mile away from the throttle body.................they say there's one born every minute!
Make sure to get the spark plugs with 4 or 5 electrodes too.
I had an old Mazda rotary--4 spark plugs, 2 distributors, 3 sets of points....the only plugs that would last more than a few miles of my driving style (8000+rpm 90% of the time) were the NGK's with 3 straps, and they were expensive as hell.i heard that 3 electrodes were the optimum number