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The difference is the stock stuff being ported vs not.
On a full tilt bolt on car the ported MSD/95mm will be marginally quicker. Roughly .1 and 1 mph in the 1/4 maybe. On the street things seem to ven out a little more.
On a H/C car it's a killer. Except no substitute. No matter what though, get your MSD ported. I have been saying this for over 2 years now. Where you spend your money is up to you.
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