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This is my second X3M, the first had a spare and I think it was less boomy over bumps. When I first got my 20 inch AS tires, the ride was improved but I was hearing the noise over bumps. Now with the MSS, the ride is much better. While I was advised that added insulation will not help, I had to take a better look at what I was dealing with.
So I looked under where the spare would have been in my current X3M and saw a lot of metal here:
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