dsg049c

I am installing TPIS headers on Wednesday and might as well replace the spark plugs.. Which ones are the best????? Thanks for your input..

:grouphug:

johnlovescar

I like NGK TR55IX Iridium Spark Plugs. I had Bosch 4 Platium before, and change them after 1,000 mile.

:steering:

Richin Chicago

This just came up in another section so I'll just paste what I typed over there:

You are going to get different opinions on this but I feel the the new ignitons throw such a spark that the advantages of copper plugs are no longer there or are so small that they aren't worth the hassle of frequent changes.

Also the folks at NGK E_Mailed me and said the Iridium was their highest performing plug. I dynoed my car and it showed 316 (SAE corrected) with just a Z06 air box) with the NGK TR55IX iridium plug. Corvette is now using their version of this plug GM# 12571164 Delco #41-985) as the OEM plug and are claiming 100K so it's one of those things that you should be able to install once and not do again for a long time.

Take a look at http://www.rockauto.com/</a> if you want to buy the new GM iridium plugs and <A HREF="http://www.sparkplugs.com" TARGET="_blank">http://www.sparkplugs.com for other brands including NGK.

DsC5

I have the NGX Iridium plugs. I'm very happy with them after about 250 miles.