Actually, I don't seriously thing a day will make any difference.

 

The OEM platinum plugs are not worth the $. Platinum has no benefit other than longevity. Theres no reason you shouldnt go with copper. Cheap, effective, just change them sooner. But anyone serious about performance would do that anyway.

OEM Sumitomo or NGK wires are fine for most applications.

 

That is what I use and have been very pleased with it so far!!!