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Despite the ongoing battle over this, here's my best advice.
Unless you have a leaky injector, it's not really necessary. The computer is set up by Mazda to provide any shut down and start up fuel cut/addition from the factory. This was something that might be applicable to a carbureted car, or like I said one that has a leaky injector. If you're having flooding issues there is something going on mechanically that should be attended to. But to each his own. I've never had a problem with my transplanted S4 naturally aspirated engine with normal shut down and start up. I trust the engineers at Mazda more than questionable advice from internet sources. If it really bothers you check with Mazda USA for their advice, dealerships may or may not give you good advice.
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