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We've meandered a bit off topic [Cool split-off, Steve]
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...........but more pots = bigger pads = much more expensive.
I'm not saying that AP Racing's 4-pots for the GTI are way and above better than anyone else's but I will go as far as saying that, for the GTI for Fast Road use, they are absolutely faultless and stunningly effective!
I'm about to find out how expensive some new DS2500 pads for them are.