I have a little to much rear brake bias with my 11 inch fronts and my 11 inch rear brakes and my stock MC. Its not bad but I really want the front to lock first and right now the rears tend to lock first. I am thinking of splicing a Wilwood proportioning valve into the rear lines. I was thinking the logical place to do this would be the firewall behind the engine. I figured I would just need to get a double flare tube and then the connectors. I have used a single flare tool before so I figure it is pretty simple. I guess I am concerned about screwing up my brakes or something and I am looking for some reassurance. Maybe there is another way to address this issue that I have not thought of yet. Any Ideas?