4 piston brembos, Master cylinder, proportioning valve confusion.

Thanks for all the replies! Definitely alot of good info. I was kind of suspecting dr. Diff would be my best bet. The products I have linked i got from him personally in an email a while back. I was just doing some further research and saw the other options and really wanted to weigh all of my options and get some experience from real life driving and builds. Thanks!