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You will lose 20+rw down low. The stock MSD never makes more peak power than the ported stock IM/TB, but it carries a lower number for longer. At the track it is worth half a tent to a tenth at best once ported and with a 95mm TB. Those are the facts with bolt ons.
Now, H/C my ported MSD/TB are worth almost 40rw over my ported stock stuff.
I port and sell both so I couldn't care less which one you go with. Just tasting what the dyno and track testing prove over and over again.
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