Originally Posted by Mimi05SRT6
According to the air/fuel on your dyno sheet, you are already running lean, so why would LET want to make it even leaner? Above 12 should be more than enough without causing any problems.
12.5 is about perfect. I am running less than that on the bottom end. Also, the tailpipe sniffer used on dynos is about .5 off from being so far down from the actual combustion.