Of no real relevance but I use mtec discs on my X5 40d and 306 gti with ebc yellow pads (I fitted them myself). No issues stopping in either but then I'm not tracking them.
I guess the question is if they can stand the heat when pushing hard? I guess only one way to find out! I've got relatively new Alcons on my car at moment and unfortunately it's currently off the road so I can't help.
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