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I'm trying to find which 1 step colder plugs i could use on my 2013 RT. I have the Zex system setup to spray between 100-125hp. I'm also going to add some race fuel while spraying. Appreciate any help..
 

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Not sure if you ever got this figured out. I've got a 13 R/t as well that I'm installing a Zex setup on. I'm running NGK 2315 plugs for nitrous and street ability. I'm not sure what to gap them at, but I'll figure that out along the way. Still finishing up the install, so I have no idea what the kit will do.
 

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For informational purposes, I ended up gapping my plugs at .035..... I've heard anything from .035-.040 is a good gap to use. I've had very good success with the NGK 2315 plug. I use them for daily driving, and have about 10 nitrous passes on them. Most of the pass have been on a 50 shot, but I do have 3 passes on a 100 shot, and 1 on a 150. No issues with knock or power loss. Hope this information helps someone new to the Nitrous Power adder scene.
 
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