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I use black 95A diff bushings and there is audible whine in some rpm ranges. I also have a 1 piece driveshaft and that may make it worse. Still, it’s not nearly as bad as my E36 that has two red 75D diff bushings and 1 solid one, along with a 1 piece driveshaft. That car sings loudly in some rpm ranges.
Unfortunately the diff whine tends to occur around highway cruising speed, like 55-70 in 6th, so you do notice it. A loud exhaust masks it a little. If this sort of thing gets to you, I’d stay stock. It might bother some but not others. Or purple 80A might be a compromised.
Obviously when you suffered damage, you want to address the problem. I will guess you do hard launches and have experienced wheel hop. Still subframe bushings and stickier tires will reduce hop, but next to nothing will eliminate it under all circumstances. You need to train yourself to recognize hop and lift throttle. Hop can damage stuff.
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