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Here is the suggested breakdown:
NGK Plug Part# = Shot Size
B6EFS(1 Step Colder) 3177 = 0-75
BR7EF(2 Steps Colder) 3346 = 75-150
B8EFS(3 Steps Colder) 1049 = 150-225
B9EFS(4 Steps Colder) 1085 = 225-300
Also recommended is to pull 2* per 50hp.
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2005 Dodge Ram 2500 RCSB Thunder Road Hemi Sport w/STS Turbo
2004 Dodge Ram SRT-10 - Silver - Stock
2003 Chevy 1500 RCSB Stepside 400SS - 408 in now awaiting Turbo
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