Just what I was afraid of after reading Randy's very good and thorough explaination of the brake caliper surface area of the old Toyota vs. new Wilwood caliper. Sounds like next new item may be a new Wilwood master cylinder with INEX stamp on it. I am hoping that the guys who will be trying this new brake package will find out that the current master cylinder will work OK with the new Wilwood brake calipers. Otherwise, where does this stop? If the master cylinder requires to be changed also, then new brake lines will be required also as most Wilwood master cylinder utilize AN type fittings as far as I recall. Pretty soon the average weekly racer just trying to have fun will be broke and finished. Sometimes change is good and sometimes not.....As I said before, only time will tell. Anxious to hear back initial results with those with the new brakes.