2004-2007 Cadillac CTS-V Performance Mods Discussion, Maggie Spark Plugs in Cadillac CTS-V Series Forum - 2004 - 2007; I was looking at going with the NGK TR6IX plugs, but think I'm going to go with the AC Delco ...
I was looking at going with the NGK TR6IX plugs, but think I'm going to go with the AC Delco alternatives 41-104 (iridium). They are also one step colder than stock gapped at 0.040" and what is used in the LSA/LS9 motor. I've always had no complaints with Delco's in my other vehicles.
I've read that i should gap them to 0.035" is that correct? Right now I have some junk champions in the car from when I bought it used. Keeping in mind I have a Maggie.
Also for anybody interested.... there is a wicked rebate going on for these plugs too. $2 mail-in per plug !! rockauto has the plugs for $4.71/each. So for $38 worth of plugs minus $16 it's only costing $22 + shipping. Rediculous.
Had tr6's now has br7ef's changed due to the increased safety of a non projected tip plug as well as 1 heat range colder. All it takes is a nice little misfire and pop. Extra insurance not to having it poke into the chamber to far. Car runs fine with them. To each there own though.