Originally Posted by MPR1
I actually contacted KW North America and they replied that they are not planning or making any coilover kit for the X1 35i at this time.
Some information if you can read german, but at least some pictures and numbers to figure some out. Doesn't state there is one made for 35i.
document pdf section
Nothing specific for the 35i, but the part numbers are universal for all other models of X1, including the N52 powered units which are somewhat similar weight wise.