seem lean 13.1 A/f
#21
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U are about same as me I run 150 shot. I have had NOS filter clogged up alittle and mess with AF. I can usually tell because purge sounds different. I also think u are way to rich N/A get it up to at least 12.8 - 12.9 N/A. I run NOS at -6 degree's timing and have 11.8 - 12 AFR with NOS.