I'm going to give it a shot in the GTO since the NGK Iridium plugs are starting to misfire after 25k~ miles
A patented technology, backed by independent test results, proves this to be the biggest breakthrough in Spark Plug history.
This spark plug is literally a game changer. Producing more HP, less emissions and less fuel consumption with easier starting - than any other spark plugs on the market!
The bridge technology riffles a wide spark horizontally across the center to ground electrode, directly at the center of the combustion chamber, totally unimpeded.
Resulting with the most complete combustion created by a spark plug ever.
Complete combustion makes an efficient engine producing more power, less emissions with less fuel consumption.
Independently Tested by Quantum Industries Laboratory, Intertek Laboratory, Muscle Mustang Magazine.
http://www.summitracing.com/parts/plt-sp-np21c?seid=srese1&gclid=CJ3o2I-t-b0CFcWTfgod0WcAYQ