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I recently installed akg red 75d poly subframe bushings and 95a black poly diff bushings. There is whine from 65-75 mph. It's not bad but you can hear it. It's diff speed dependent so a dct may differ from my 6mt. I like the improvement in rear end feel from the subframe bushings. I did the diff bushings because a few people have broken diff bolts or damaged their diffs or even their subframe. I would not go any harder than 95A for the diff. Powerflex purple is softer. I did drive a solid subframe solid diff car but it was a convertible and the top was down so I heard other sounds.
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