Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - intake manifold butterfly flap issues
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Old 09-09-2012, 07:00 PM   #15
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the mazda guys delete these on a normal basis. and even on the stock tune runs just fine. they have to do with the cold idle more then anything else in all truth. you do see a little gain in the top end from removing them. low and mid range is unchanged.

also the mazda 2.0's dont have them, but the mazda 2.3's do. id assume the ford counter parts are the same.
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