I have Pagid RS-29 on my Z4M with AP racing brakes....on my Z4M they don't make a lot of noise and I also use the RS-29 on the street. For trackdays with my M2 I used Endless ME-20 and they are noisy as hell...for my next set I also wanted to use Pagid RS-29 on the M2... How noisy are they on the OEM M2 callipers?
My M2 with Endless ME-20