RJM87GT

Do the denso iridium spark plugs add any significant horsepower or isn't it worth $15 a Pop!!!

stanglx2002

i would say just get Autolite #25's and spent your money else where

Djs94stang

Same here...autolite double platinum...APP25 for N/A engine.. If you are boosted in any way you'd want to knock down the heat range....APP24

stanglx2002

Dont put platinums in 5.0's they dont work well in our cars. I know from experience bc i had platinums in my car and then changed to standard autolites and it ran a lot better

Djs94stang

If you're talking about Bosch platinums with the wire electode then I agree. The autolite platinums are visually the same in regard to elecrode size...the only thing different is the material...platinum vs standard. Platinum justs last longer. I've had this set in for 70,000 miles and no problems at all.

Pure5.0

I agree with the platinums. It is just material. Plus the Bosch are pretty bad plugs. Don't hold up worth anything...

Word of the wise...companys can make plugs sound appealing and look great...leading to you paying a lot of money.

But think of the properties of electricity. Travels the shortest or least resistant path. Meaning that only one of the 2 or 4 prongs will have electricity flow through it. Leading to a uneven wear on the electrode because the plug was "designed" to have all 2 or 4 spark. This applies to the Bousch platinum +4