Im looking into doing an ABS delete on my FD but plan on keeping the factory calipers and just update the rotors and pads. My question is those that have gone with an aftermarket proportioning valve and have kept the stock calipers, have you experienced any negative effects? Preciate any reply.

 

Look up Alex Rodriguez's kit on ABS removal.
I'm not sure about the Proportional valve but I do know that he made lines to convert the FD from ABS to non ABS.
It's a start.