Unlike many other upgrades changing the suspension components is possible aftermarket including a warranted JCW conversion. I haven't read a post saying. "i have tried the sports suspension in the cooper D and it is so much better" or a post "saying the standard suspension is rubbish, I wish I'd had the sports". Obviously the sports suspension will have subtly different characteristics in the D as opposed to the S. so I have not specified it. Having said that in my previous MINI I would have had the JCW suspension if it had been available.