Whistle at certain throttle position

[UmbraMortis]

Hey guys, I have a 2017 gt California special mustang. Few weeks ago I added the gt350 intake mani and throttle body. Couldn’t get the tube correct for the infamous 87 mm gt350 tb so I throw the stock on back on with the blowfish adapter. Lately I have been hearing this relatively feint high pitched whistle when at only a certain throttle position, any less and it’s gone, any more and it’s gone again. It’s more evident when windows are down. Anyone have any ideas? I also have a Roush CAI, Roush axlebacks and x pipe res delete. Thanks for any help!

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[UmbraMortis]

I also recently installed pedders extreme coil overs and Eibach front and rear sway bars but I wouldn’t think it would be caused by those. I feel like it comes from the front but not 100%. It doesn’t make any whistle in park. I don’t even know how I would isolate where the sound is coming from when I can only hear it when driving.

 

[Grimace427]

Normal sound from the throttle body that was previously muffled by the stock sealed intake airbox.

 

[UmbraMortis]

the Roush CAI was the first mod I put on though and I didn’t hear it until recently. Maybe the intake mani amplified the sound? I just wanted to make sure it wasn’t like a vacuum line leak or something

 

[gmupatriot]

OP, I would just go back and make sure everything is buttoned down and sealed properly. It could be a small leak and if not could be normal due to using the upgraded TB.

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