One video in particular, was a M3W going down terraced hill and the road was serpentined back and forth with 180° hairpin turns at each end of the terrace drop. When he made his left hand turn he could not just turn around the corner, he had to stop and back up the hill and then take off again.
This seemed to be very poor turning quality if you cannot negotiate a turn in the road without doing a back up to turn.
I’ve reviewed you the exhaust statement and it does make sense, it’s very tight. I looked at a picture of the ACE and they tucked the headers under the front shock and then kicked out around the foot wells for a much tighter huge of the body.
I would place the mechanicals of the vehicle and turning sharp enough to make tight street turns ahead of the header design. If you have taken a look at some of the custom cycles being built out there you can see a lot of ingenuity in design to fit in tight spaces.
As a somewhat crude example of tight bends in exhaust, here are a few shots of the header pipes I’ve put together on my boardtrack bike project, which needs to be finished and sold prior to a M3W commitment.





In this picture you can see the flexible heat riser tubing that you can buy at the Auto Parts Store. This happened to be 2”, the smallest they sell. You can see how well you can bend it to conform to your needs. Then once you have what you like, just cut and start welding tubing to match. It’s very time consuming, but well worth the effort in the end.

Sorry for the rambling and many pictures, but when I get started, hard to stop…