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most off the shelf lambda probes only work over a very narrow range and are not much use to us guys who want maxium power, personally i cant see the point in permantly fitting one, although i do have a boss for one fitted in my collector box (an m18 nut actually) its usually pluged using an old pinto spark plug, but when i'm at emerald's rollers we do fit their super duper special 6 wire probe so we can fine tune the mixture, which can be very finly controlled on engine management, although it speeds things up if your mapping from scratch it hasn't actually gained me any power, but with carbs i think it would all be a bit of a waste of time.
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