well i had a no.2 cylinder at 81 psi on a compression check and my coolant was always over flowing after boost and i just got my head off and found a hole in between no.1 and no.2 cylinders where my cooling system was being over pressured but the main richness problem hopefuly the low compression in no. 2 cylinder so after my hks head gasket and arp head bolts come in i will test the ox sensor to verify
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