Actually side exit is illegal in Illinois, and I had a heck of a time with my Lil Red in the late 80's trying to get it passed through emissions. I finally had to bring in factory brochures and they gave me an exemption. I am not sure about dumping behind the axle either, I will have to find out.
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.
I am not sure about dumping behind the axle either, I will have to find out. 
