My experiance with hydro boost is it does indeed feel mushy when stepping on the pedal, I can push the pedal to the floor on most of them I have driven while in park, when moving you can't do that without flying through the windshield. It is just a strange feeling pedal, different from wht you are used too if you have never driven a vehicle with it. The only reason to convert to it is you have a radical cam that makes less than 14 inches of vac. The best mod I did to my braking system as far as pedal feel was a set of braided lines to replace the oem rubber ones.