I usually get those *in* my 911 but that sounds fun too.
Seriously, If you do a lot of rain driving it is absolutely worth it. If they aren't much more $ than standard rotors then hell, why not? I have gotten my stock brakes to fade in street driving. Albeit very high speed panic/late braking type street driving but nonetheless.
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Tyson Schmidt
72 911 Cabriolet
92 C-2 Cabriolet