Spark Plug Gap
Stock Coils – .020-.024
Coil On Plug – .022-.026
More Boost = Less Gap
100HP Over Stock = 1 Step Colder Plugs
Evo 7/8:
Stock heat range:
NGK – BPR7EIX
Denso – IW22
1/2 step colder:
NGK – BR7EIX
1 step colder:
NGK – BPR8EIX
Denso – IW24
1 1/2 step colder:
NGK – BR8EIX
Evo 9:
Stock heat range:
NGK – ILFR7H
NGK – LFR7AIX
Denso – IKH22
1 step colder:
NGK – R7437-8
Denso – IKH24
Evo 10:
Stock heat range:
NGK – ILKR8E6 – OEM part #1822A021