What size T bolt clamp do I need to secure a silicone coupler to the stock throttle body, the cars at my parents house, so I cant go out and measure.

Neil

 

Never heard of it called a T Bolt clamp o_0 I believe it's a 6 or 6-1/2" Come to think of it, I have one outside on my old stock elbow, I'll go measure it. I'll measure un-coupled length and it as a circle (even though it's oval).

EDIT: Circle: 4-1/2". Total length 14-3/4"

 

its a tight fit with a 4 inch coupler over it...so prolly 4-4 1/2 inch...