in the back, meaning you can't hook that bolt through the back of it. But, you would be tightening the nut on the outside of the thottle body in this proposed setup not "inside the plenum". Oh well, if there is no place to hook it appaently doesn't matter. I will have to modify my plenum like yours to make this work. Looking forward to your complete write up. BTW, thanks for the reply! I'm glad some people have something better to do than refresh tt.net all night. Cheers to your hard work and info sharing, keep it up!