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the best thing to do is to bring you car to a shop with a dyno and a lambda meter- i.e. a motec setup. You dont need to buy one since its only used for tuning- and the shop should be ably to tune your a/f ratio using the dyno and the lamda meter. Now the only way to benefit from having this done and tuning it correctly is with a proper engine management setup i.e. hondata. I know this sounds like a lot of work just for a/f ratio but it makes all the difference in how your car runs both for racing and for street driving