I have a friend who can make it for me i just have to get him diagrams or written measurments or the pipe i need him to make.

I have been to all sorts of sites with how to make them but none of them accually have measurments. Im pretty sure its not built to a point that theres not a standard form that will fit most 4runners.

 

Veitone. .........You need to make up a mock pipe using something as a guide. Because of the shape it doesn't have to be an exact fit. Use the pics in my post Hope this helps
UK