Michael:
Use this web site -
www.onlinedocs.andersonpublishing.com to read Ohio Revised Code and Administrative Code on exhaust systems.
Then you can compare this system to the regulations.
Ohio Revised Code 4513.22
Ohio Administrative Code 4501:2-1-14
This is the answer I recieved from the Ohio State Highway Patrol
The link is not working go figure, I'm still working on it