CanAutM3 CS doesn't have a stronger top end, a proven fact that's hard for you to swallow I'd understand. In fact, top end across base/zcp/cs are identical. You can find many dyno overlay to show that and the datalog here is even more educative if you're familiar with these stuff.
What's only confusing is CS' much better magazine times reported, which probably is not true. Of course mag time is much more acknowledgeable "from your part" I take it LOL
Anyway, CS is already blistering fast stock, so is any S55 for a power source of compact sedan and sedan derived coupes.
OP made an excellent thread, more informative than all the stupid threads here in the past few years combined.
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