40N/30N is not that far from 27/34 zenki brz or 23/37 zenki gt86. Hence most probably with similar grip tires it will in similar way often ride on bumpstops. Can car be driven/tracked on these (or on stock)? Certainly. Heck, i tracked car on stock shocks for 2-3 years. Even on bottomed suspension one can drive & turn. But is hitting bumpstops often optimum way suspension should be designed and work as, fine control wise? What's with hitting some potholes or kerb mid-turn on already bottomed shocks? Not something i'd expect if paying premium. Imho "old" MI20 was still usable enough on road, yet more capable on track, where people more often then not move up to grippier tires from stock primacies. So MP20/MP21 stiffer in front, softer in rear vs stock. Sounds like more understeer biased. Also stated for 15-20mm lowering vs stock. Imho when reducing travel also make sense to up spring rates too, exactly to to not hit bumpstops, no?
Though possible that i'd bash new kit way less, if they still left old kit available alongside new one instead of discontinuing, and leaving just one, imho less desirable configuration/compromise. Or if my usage target had been more oriented to DD only. Pitty, that by time i got some budget for coilovers and even while considering in past MI20 too, it already disappeared from inventories of all shops.
It's nice to hear that MP20 valving allows slightly stiffer springs too, but i doubt it will go as high as 60/60 of MI20, or if one will install such springs, if valving will be well matched to such spring rates. And certainly getting another spring set will rise cost of package. Sounds to me lot of small non-optimal things to get and live with when already paying premium.