If anyone is interested, Endless now has pads for the M235i -- their MX72 compound. It's a street/track compound that is a bit more hardcore (and expensive) than the RS-4's or Yellowstuff's -- $370 bucks an axle.
If anyone is interested, contact Endless at
info@endlessusa.com and ask for Erik. It's the same pad/part no. as the M3/M4 pad (we have the same calipers).