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Is the sway bar sitting parallel with the ground? On my R60, I had to change out the sway-bar links after lowering on KW v3's because the sway bar was no longer sitting parallel with the ground at rest. Aside from potentially banging on the surrounding pieces, a sway bar that is angled relative to the ground (due to a lowered suspension) is not behaving as intended from a performance standpoint.
I doubt this is an issue in your case, both because you didn't seem to lower it much and because I'm sure you would have identified that as the cause if it were, but I thought I would toss it out on the off chance it was overlooked. It happens to the best of us!
Other than a cocked sway bar, my only other thought was the Milltek mufflers; like you pointed out, they look quite a bit larger than the OEMs.
(Note that both potential causes -- the larger mufflers and a cocked bar -- could work together to produce the issue you're describing.)
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