NGK Iridium = 2315 two stages colder than stock 5.7L (I got mine from Moe's Performance)
NGK Copper = 4305 i think (Try rockauto)
Iridiums are quite a bit more. $115 for iridium vs. about $45
07 R/T Inferno Red Crystal Pearl - Mods: FRI milled S/S heads, Sparrow cam, Borla Longtubes, JBA exhaust, 09 Getrag LSD rear, 09+ R/T Intake Manifold w/ Crank This! spacers, 09+ R/T fuel rails, High Side Motor Mounts, UDP, Ported TB, TruFiber SRT hood, C&L CAI, EVS alarm, 180* tstat, no ESP - ARD Tune: 358HP/400ft-lbs
is there a big difference in performance
I'm not really sure about the difference in performance. Its what was suggested to me when I did heads and cam.
I pretty sure the 4305 for the copper is not the correct number. Stock is 5306, 1 stage cooler is 4306 and not sure about 2 stages. Just should be heat range 6.
Copper will need to be changed waaay more often that platinum plugs.
2008 Charger SRT8 (8.26 @ 85.45) - (12.95 @ 108.90)
If you're running nitrous, go with the platinum or copper. It depends on how much you plan on spraying. If you're spraying a big shot I would not use the iridium.
06 MSRT8 Mods: PWR 393 with Procharger F1A.
Installed by AfterHours Mopar Peformance.
first question, what are you running now? srt plugs, or 1 cooler than that already?
I'm running srt plugs...
Do u think that if I'm very rarely gonna be sprayin I should use 2 steps colder and copper or iridum? What drop off in performnce it gonna be the difference between the two plug while running N/A?
This where I get mine.
To My Beloved Father, Love You Dad
I use two steps colder for 150....anything over 200 you should be using copper plugs with some timing adjustments as well as fuel adjustmebts to be on the safe side...copper will not last as long as iridium but if your guna run your nitrous casually then use the iridium ltzr6aix I believe is the number...I coulf be wrong but two steps is what they are.....if your guna shoot regularly then I suggest to use copper plugs....my .02 cents...
07 Steel Blue...faster than you!...shooting for a 10.0 next time out to the track...
DAve at niteous outlet told me to go with 2 spets colder but Chris at nitrous outlet said go with 1 step...
I will be shoting a 150 shot