[Juergen]

What are you using the for? Some custom jobs used them for looks only so mounted them directly to the body/running boards/frame and hid the input under the frame. I attached them to the exhaust pipe and T-d off the input to go through the mufflers when the lakes pipe was closed. In this case treat it like an exhaust pipe and use appropriate exhaust hangers. Some states consider this a cutout and can write a citation for this. The worst part is when your buddies want to hear the open pipes after you have done a pub crawl. Not good practice.