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I dont know WURs only how to test them with gauges. I have an 089 on my 82 US engine. Actually the entire CIS is a Euro one. So I'm running large intake runners on small port heads. Yeah a mismatch there and probably a little loss, but I have no lambda electronics to mess with. Car runs great in all weather. Just use the 089 and you'll be fine OR go no WUR.
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83' Coupe - Ex-RaceCar
77' Targa Narrow Body - SC powered
Copper Brown Metallic
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