I have some ideas on my car as well but it is going to be a PITA to make large diam exhaust fit, even if I consider oval tubing. I may use a mix of oval and round tubing as I like the Dynomax stuff I used on the Porsche and they have round inlets/outlets. One cannot underestimate the value of noise and hell fire when you track a car! One day a few years ago at a track in southern CO it was just me out there and a guy showed up to see what was going on at the track. He heard my car while at the grocery store a few miles away and he thought there was an event going on!
You were the brighter of the two of us with a little less set back, at about 6" from stock in the Nova I am having to really think about how to make the floor mounted pedal assembly clear the gas pedal
It definitely cuts down on the fab work. I will figure it out but I don't want to be sitting in the car like a Cobra with my feet clear to the left, or the opposite of the 914 where legs went right to clear the wheelwell. In the stock 914, they actually mounted the seat square in the car, pedals square but offset right, then put the steering column in at an angle! It forced me to sit in the seat sideways.