for a DD (which is sort of what mine is...just don't drive it very often) on the streets, the B14 + whiteline RSB has felt terriffic. that being said, i've only put 140'ish miles on them thus far. not sure if they are truly broken in yet. but i can't imagine these being stiffer. it already feels rock solid just coming off my driveway bump. i wasn't willing to spend $500 for the small % i might get out of it, if i'd even know what i was missing.