Well I’m only group b (and just recently) with a 2013 so no stillen brake duct option. I use xp10/xp8 with zero brake issues (again still new) and also I’ve only been to leguna so mild weather vs buttonwillow or thunder hill but my last track day I had a really awesome instructor (raced formula fords and other stuff through his career) who had me focus much more on braking and smoother braking. I could see after my runs the brakes were not nearly as hot as my track day before but I’m still frustrated with the Harry’s app so I can’t say what was truly faster.
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