Hey guy...I've owned the BBK 70 and a 75mm Throttle Bodies and now run a FRPP 65mm. The 70mm from BBK whistled on mine also at part throttle until the day I sold it. Good news was the car ran great! But it was annoying and I never got a firm answer on WHY it did that. I recall several comments by folks I respect indicating it seemed to be inherent in the BBK 70mm...not all, but quite a few. I also ahd heard that drilling a small hole in the TB blade "may" cure it? Good luck towards a resolution because it is annoying isn't it?
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