So I have a set of four NGK double plat from when my civic was totalled. They have about 4,000 miles on them, so in a sense brand new. Now I looked online for the spacing that the civic requires (i think it said .44) and then compared it to the spacing required for our tc, they were the same. My question is should I put them on? Could there be any negatives with this? I understand our OEM ones are iridium would double plats hinder preformance?

I'd say the stock plugs are pretty good... If anything, you'd want to upgrade the lines.

I just figured since I already have them, why not... right?

I just figured since I already have them, why not... right?
Wrong! Why? Iridium > Platinum. Your tC came with Iridium plugs stock, and Scion indicates they don't need replacing for 120k miles. Why downgrade to platinum? :wink:

funny, when I had the civic, plats were better than iridium or atleast many argued that.

get the spark plugs and throw them at rice burners windows... watch them shatter :P :P

You dont need to upgrade anything. Our plugs are better than the ones you took out of the civics. Our wires are 100% fine.. we have coil on plug ignition. The wires feeding it are low voltage, that is a huge part of the point of coil on plug. So replacing them is useless as well unless one is bad. One thing on this car you will have a hard time improving is the ignition system. And no, plats were not better.. too many people listened to marketing bs.

...plats were better than iridium or atleast many argued that.
:lol:

I hear ya. Ignorance and misinformation are far too common. People need to research technical information from several sources for themselves, to determine the truth. This is especially true with audio, as even this forum has threads with misleading and/or incomplete information.

From Wikipedia: http://en.wikipedia.org/wiki/Iridium


"A dense, very hard, brittle, silvery-white transition metal of the platinum family, iridium is used in high strength alloys that can withstand high temperatures and occurs in natural alloys with platinum or osmium."

"Iridium is the most corrosion-resistant metal known. Iridium cannot be attacked by any acids..."