[indy91zr1]

so after checking somethings my car has autolite 26 plugs. Is that plug to hot for just headers,modified airbox,tune? I honestly have never heard of the 26. I am used to running ngk iridiums in everything I have owned. Would it behove me to replace them?

So I went ahead and bought some ngk vpowers per Todd P's recommendation. When I pulled all the old plugs out there were 7 autolite 26's and one ac delco. I am sure you can guess where the ac delco plug was. Car runs leaps and bounds better with the new plugs.