The rule of thumb is:
3 respiratory mods, you need a tune.
Example, intakes, hf cats, cbe, or; intakes, long tube headers, cbe.
For 2 or less breather mods, the ECU can adapt. A tune can help, but isn't really necessary. (A tune can help an unmodified car, as well.)
(Oh, and the Stillen will see more gains, compared to the K&N's. But you knew that, dintcha? )
Kirk B.
Last edited by crazy4oldcars; 03-08-2020 at 10:46 PM.
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