That's why your torque is so good because of the 12.1. I'd say 12.0 is fine if your tune isn't on the edge meaning a ton of timing stuffed in it or high Iat. If you see it creeping higher than 12.1 I'd get out of it. 11.7-11.8 is perfectly safe. 11.5 or lower is very safe.
What are you taking about? His “tune” is causing the 12/1 so it is on the edge.
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