So not really a how-to, but more of an informational and what I did to get this going.... I'm sure there are better ways to do this but this is how I did it. So I'm using an Accufab 70mm TB. Its a damn nice piece. Comparison to a stock Windstar throttle body. I am not using a modified IAC system. I retained the factory IAC location and function, so when using a Mustang style TB, the IAC port needs to transition from the higher Windstar intake, to the lower Mustang TB. So I had a plate made to do this w/ a 70 mm opening. Here is the stock set-up with the Windstar TB. And the factory intake opening. So in this shot I bolted my adapter plate to the intake, you can tell the 70mm hole is a bit bigger than the factory opening. With the intake off the car, this job is much easier and you can thoroughly clean out the intake after your done. When I removed the factory gasket and lined up the spacer, I could see that after I opened up the inlet, the factory gasket wouldn't fit tight in there anymore. I decided I would fill this recess and then make a conventional cork/rubber gasket after I was done to seal it up. I used a JB brand epoxy putty. And then filled the gasket recess. Two other areas of concern after I took a close look at the intake were the top and bottom just behind the TB inlet. They are really close to the same size as the factory TB inlet size. So these areas also received the epoxy treatment.... So after the epoxy hardened, I sanded the TB mounting surface flat... Time for porting.... Yes I used a holesaw bit. Its probably crude, and yeah there are better ways to do it. But this option seemed the easiest for me and it does work. I used my adapter plate as a guide/center for the hole saw bit.... And bolted it down tight. Time for some drilling.... It takes some time, and you don't want to get too crazy with it, the plastic can melt, but it wasn't too bad. Eventually if will go far enough to remove the necessary material.. Oops.... Yes I broke through the intake.... Even with my preparing, it still broke through on the top and the bottom. Partially my fault as I drilled too deep into the intake. But its still ok, the epoxy can be used to fill the holes and it turned out fine. Here is the bottom after some epoxy, sanding and paint.... I got a bit rushed to get the car running, so the topside is not as pretty, but it is sealed and is relatively smooth to the touch.... Here is the final product.... Intake opening at 70mm to match the Accufab TB..... Also took the opportunity to open up my intake pipe a bit.... Before with hodge-podged BBK intake of sorts.... And with my new self-built intake.... 3.5 inch pipe.... If there are any questions, just ask. I did have to modify a couple things on the Accufab TB to get it working properly, but I think depending on your year, you wouldn't have to do what I did. I can elaborate if needed. Feedback appreciated.