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There are several msd ignitions. 6a is w/o rev limiter, 6al has a limiter (the "L"). The digital 6+ also has a limiter, and doesn't require pills as does the 6al. No, they're not going to hurt the car.
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'93 B13, etc. 
If you don't have the patience
to do it right the first time,
how is it you have the time to
do it over and over again?
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