200R4 update
Funny you mentioned that. We were discussing ways of making oval exhaust tubing because it would keep the volume of exhaust flowing. I didn't know it was available to buy. I am planning on running the car on open headers about 10 blocks to The Wonderful Muffler Man. Ozzie has been doing my exhaust for years. His tubing could be used to make shotguns, it is so thick. I will have to ask him if he has oval tubing or if he can get it.