What plugs and where to buy?

**USCG Charger** · 10-15-2009, 01:26 PM

I need spark plugs that are two steps cooler for my car. I was told that the copper plus were cheaper vs the Irim... plugs...

What part numbers and where to buy for cheap?

**RedRaider** · 10-15-2009, 02:13 PM

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

**USCG Charger** · 10-15-2009, 02:16 PM

is there a big difference in performance

**RedRaider** · 10-15-2009, 02:42 PM

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.

**96GTS** · 10-15-2009, 04:20 PM

Copper will need to be changed waaay more often that platinum plugs.

**robsrt** · 10-15-2009, 04:24 PM

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.

**Fargo59** · 10-15-2009, 04:33 PM

first question, what are you running now? srt plugs, or 1 cooler than that already?

**USCG Charger** · 10-15-2009, 06:40 PM

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?

**NYCSRTATE** · 10-15-2009, 06:41 PM

This where I get mine.

https://www.sparkplugs.com/default.asp

**ujokin2** · 10-15-2009, 06:52 PM

Simple ole Champion Copper is what is used in mine...

**robsrt** · 10-15-2009, 06:52 PM

Originally Posted by USCG Charger

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?

I think it depends on the size of the shot. I use one step colder all the way up to a 175 shot. However, anything above that I'll want to go colder. I would stay with the copper. I don't think going one step colder than the SRT plug is going to hurt you. Just one thing you need to be careful about, if the plugs are too cold you'll foul them out driving them on the street. You may have to change them at the track.

**Lajus007** · 10-15-2009, 07:04 PM

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...

**1FST4DR** · 10-15-2009, 07:06 PM

Originally Posted by robsrt

I think it depends on the size of the shot. I use one step colder all the way up to a 175 shot. However, anything above that I'll want to go colder. I would stay with the copper. I don't think going one step colder than the SRT plug is going to hurt you. Just one thing you need to be careful about, if the plugs are too cold you'll foul them out driving them on the street. You may have to change them at the track.

Correct..Jason,Stick with one step colder.You'll be fine.And go for the copper..