yes its caused by air passing the small idle hole in the plate, BBK drills them at an angle and thats what causes it, ever blow on the mouth of a beer bottle at an angle and get a whistle? same thing
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88 Notch, 3.73's, Ported E7's, Explorer int. w/ ported lower, pulleys, 1.7RR's, BBK headers, off-road H-pipe, flowmasters, subframe connectors, 65mm TB, shift kit, March ram air ,MSD coil, U/L control arms, 155lph fuel pump, cheap 2800 stall, Crane Adj.FPR, best 1/4--> 13.77@101.35
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