I used this TBS on 'oo Bravada and installing it with the included instructions was confusing. Take your time and look at everything in front of you and how the throttle body works and you will figure it out for yourself much faster. As for "whistle", I didn't notice. My throttle response improved, but not by much. In terms of fuel efficiency, I noticed a slight drop of 1-2mpg. I won't say I'm disappointed with this product, but it definitely didn't impress me.
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