Tom, I have the Falcon SS headers (split, duals) and the Falcon SS dual system. My problem was and is the Falcon mufflers are huge and hang really low. There is no adequate way to "hang" them so that there is room for them to move. So I used a unique way to mount the whole system. From the header back, I mounted some SS flex pipes (10" long each) from header to the rest of the system, then rigid-mounted the rest of the system on special cross bars that I rigged. If you get what I am talking about, the system doesn't vibrate or have room to expand, save for the middle sections of flexible pipes. The flex pipes are triple-walled SS pipes that were custom fabricated. The system works well for me. The mufflers are still huge, but are rigid-mounted all the way to the rear of the car.