[CREWZIN]

Can't speak for the dealer, but there's a lot of us that put the Champion Double Platinum plugs in our N/A PT without problems. I've had them in for over 20,000 miles. Whatever plugs you decide to use, don't forget to use Anti-Seize Lubricant on the threads of the plugs and Dielectric Grease on all the electrical connections (wires).