Follow up for other users: issue was a blown header collector gasket. Went with embossed copper gaskets for blow-proof setup. Also adjusting idle AFR for better idle quality. Runs 100% better now.
Follow up for other users: issue was a blown header collector gasket. Went with embossed copper gaskets for blow-proof setup. Also adjusting idle AFR for better idle quality. Runs 100% better now.
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