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Both ignition systems work well, but for me they have different advantages. The Bosch is probably more reliable (although they are very old now). The Bosch works well for a stock street car and will allow longer life of components such as rotors. The MSD is cheaper, more available, can support a bigger spark plug gap (this will ignite more marginal mixtures and produce more power at a given advance). I like having a rev limiter I can set as well. I think most of us know all this and have chosen the ignition to suit our needs.
-Andy
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72 Carrera RS replica, Spec 911 racer
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