Clueless here.....
Confuses me as well. I've asked numerous people in the know here but no answer to the gap difference. The answer I got back from the Denso tech was "Oh really?"
The dealership suggested the NGK's only because they are gapped closer to the original plugs. As for price, the GM for NAPA here says NGK have deliberately priced their Iridiums to gain market share which explains the savings over Denso.
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2004 DC Limited 4x4//JBA Headers & Y PIPE//Firestone Rear Air Lift//Hellwig Sway Bar//Protech EZ 1" Lift//Air Induction//Ledco Custom Rack
Raider Canopy//Street Scene Grill//Magnaflow Muffler//Piaa Lights//Amsoil Fluids//Nokian WR Shoes//Unichip//Westin Bull Bar.
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