the most common problem we have come across using the standard platinum and iridium plugs is the breaking of the tips = engine failure! also the blow out of the spark = det.
The racing plugs will have the centre electrode seated inside the housing,which remedies both causes!
This is a must for all those of you who want optimum power delivery and have paid good money for your engine rebuilds and most importantly for those who do track day their cars.
Now ready and developed!!!!!!!!!!!!!
Also available for other cars mail me application and i will be happy to help.thanks.