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I can live with it if it's considered normal. I can always swap back to OEM between track days. Just want to make sure I'm not damaging the load bearing surfaces inside the calipers where the pads are inserted.
I've spent at least the last hour reading various posts online from BMW, Lotus, Golf, etc. owners. Turns out this is caused by the backing plate on aftermarket pads being of smaller dimensions than the stock pads. The pad is literally shifting inside the caliper and making clunking noises. It's supposedly to allow for thermal expansion during track use and also to make removal/installation of the pads a bit easier since they won't bind to the caliper. A lot of people have come up with temporary or permanent DIY solutions, but it seems it might also be possible to simply re-use the stock anti-rattle clips that go on the ears of the stock pads. I have the OEM pads sitting in the empty Pagid boxes, so tomorrow I plan on looking at everything to see what my options are.
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