i drive my car on the street at least 5 k a year, and my wilwoods are still sealed , and i dont have an issue with dirt,seales leaking nothing,i highly reccomend wilwoods, you will not believe the stopping power, lighter un sprung weight,look cool too!
However make sure you get the right axle hub, as there are 2 sizes they make, i got the wrong ones , as the hat/rotor was not centered on the hub because it was to big and resulted in being centered on the studs, this made a bad vibration, so i purchased the smaller hat/rotor,and had them machined to fit the hub,this is on the rear of axle, hope this isnt to confusing, but over all they are very nice brakes , way out perform the stock brakes