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Need help choosing plugs for my car. The research i do says to use colder plugs for higher compression. I prefer autolite. Not sure of my exact compression but is higher than factory compression. Thank you
 

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Just cross match the Autolite to a AC R45TS or R45T, or if you feel it needs to be one heat range colder then R43Ts or R43T.
The "S" designates extended tip, tends to last longer in daily use but can cause detonation in race use so that is why I mentioned the non-S version.

Autolite 25 or 26 for the R45TS
Autolite 23 or 25 for the R43TS
 
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