1. (a) The exhaust system shall include all piping leading from the exhaust manifold, to and including the muffler(s) and tailpipe and all gaskets, seals and hangers. The system shall not extend into the body and shall be attached to the chassis. The exhaust system pipes shall be continuously formed manufacturer's standard sixteen (16) gauge steel or equivalent strength material. The complete exhaust system shall be tight and free from leaks and shall be properly insulated from the electrical wiring or any combustible part of the bus. The size of the pipes in the exhaust system shall not be reduced below that at the engine manifold. The exhaust system pipes shall not extend more than one (1) inch beyond the limit of the rear bumper or its wraparound and shall not exit out to the right side.
2. (b) The exhaust system on a chassis shall be adequately insulated from the fuel system, and shall not exit beneath the fuel door.
3. (c) A left side exhaust shall terminate to the rear of the rearmost tire and rearward of the rearmost operable window.

(Adopted effective May 2, 2007)