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Which tune would be best for a K&N drop in filter, the 91CAI or the regular 91 tune and why ?

regular 91 tune, the CAI tunes adds fuel for the extra air of a CAI, but the filter alone will not improve airflow to the TB.

Thanks Mike, appreciate your quick reply.

I've heard and witnessed otherwise. I ran the stock 91 tune and had some knock. Called around to some of the people who sell the Predator, and they told me to try the 91 CAI tune and log for ST knock. They were right, knock was reduced.