From there, Jim moved onto getting the exhaust routed. He had to drop the intermediate collectors 2 inches to get them under the car and he still had to do a small mod on the floor. Those headers are off a cup car...Jimmie Johnson's 48 to be exact.
We are trying to keep as much heat away from the driver's side of the car and also keep the exhaust as high up in the car as possible for ground clearance.
Jim made the transition to oval tubing. Notice that he made a connection between the to oval pipes as a H pipe/balance tube.