I pulled both off the self at work t other day.. no appriciable difference.
The 522x series have a slightly longer electrode (longer ceramic peice) so
that they stick out farther into the combustion chamber. I don't know if
they actually stick out farther than the 392x series, it just looks that
way. But either way, make sure you get 1 range colder than stock
(3923/5223)
> I need to ask again what everyone prefers the 3923's or the 5223's and
what
> would i gain from either? mileage / performance wise...???
> Thanx
> Paul
>
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