Spark Plugs, heat range question

[4wheelpilot]

Seems to be a very common recommendation to gap the oem spark plugs if tuning the Stinger.
And some members recommend a higher performance spark plug.

HKS high performance plugs (like HKS M45iL) are being used by members.
But which heat range is preferred and why?
7 (like oem), 8 or 9?

And are the HKS plugs available gapped between 0.025-0.028 already?

 

[Kamauxx]

Check out this thread: How to avoid blown spark plugs in your tuned Stinger