You may try as low as .042 according to other discussions of plug changes for turbo 2.4L in PT. Stay away from dual tip, splitfire, or non copper dual or triple electrode designs.
The #440 Copper Champion seems to be the most durable, and least like to cause detonation or "diesel effect" from too small of an electrode heating up enough to ignite fuel without a spark.
It also should be a little "colder", with the electrode more recessed, which, again is less likely to heat up to the point of misfire in a Turbo or Super Charged engine.
There was quite a bit of discussion on the PTCC site, and posts by MX-5 seemed to be very accurate in explaining the differences and what the outcome would be from different types of plugs.
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