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				Originally posted by AzCivic  
i've been running my MSD digital 6 for at least 6-8 months now, it works great. better response and when reving the engine it feels smoother than it used to. 
			
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Get the 6a if you are going to be racing A LOT... the only difference between the 6 and 6a is a rev limiter and $50.  6 is $150 and the 6a is $200.  Notice better throttle response and overall efficiency.  No power gains... you don't upgrade your ignition for horsepower.