Question about throttle bodies. Is it worth the money to upgrade. I read somewhere it said the mustang had a single 70mm throttle blade but when I looked at mine it has twin throttle blades. Does anyone know what mm the factory twin blade throttle bodies are?

 

About the only TB upgrade I've seen that was worth doing, is switching to a GT500 TB on a high HP blown application. For 500hp and below, I don't think they are worth squat. But they do make pretty billet doorstops.

 

you are correct I made the mistake buyint the GMS Bullitt TB, it caued so many issues that I had to toss it. plus I did not gain any hp or throttle response, so spend on somthing else.

The Stock Throttle Body is a dual-bore 55mm The aftermarket ones are 62mm