yes, you actually NEED to take it out as the ratio changes with the different m/c. The front bias is fine with the new m/c. I did, however, forgot to mention that I put in an adjustable prop. valve to control the back bias with a manual valve so you can fine tune the front to back ratio. I bought mine from summit for like 18 bucks and mounted it next to the m/c. When you find an s-10, the m/c will have two short brake lines coming out and then go into a prop. valve. Get both the lines. I used one of them as the "go between" of the new adj. prop. valve and my out going rear line. I also did have to buy like 8 bucks worth of brass fittings to connect the lines to the prop. valve and to connect the lines under the car where the old valve was removed as the incomming and outgoing line fittings were different sizes.
hth.