Professional Products Throttle Bodies are at the very top of the ladder when it comes to quality and performance. You can pay more but there is no way you can buy a better throttle body. Many of our throttle bodies are premium die castings, just like the O.E. models. Otherwise we use permanent mold castings. No sand castings. They feature precision fi t throttle plates and dead accurate machining. All of our Ford throttle bodies through model year 2004 now have C.A.R.B. approval making them fully street legal in California.