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it's very expensive....but also very helpful.With a wideband there is no need to pay a guy to tune your car, you can do it yourself with this gauge...but you also need like a s-afc or something to tune the car
it's not THAT expensive. you can get a innovative, which is one the most expensive ones, for about $350. considering that it's $3000 for a short block it's a relatively cheap investment.