Section 575IAC1-9-32. Exhaust system

   (a) The exhaust pipe, muffler, and tailpipe must be outside the bus body and attached to the chassis per the manufacturer's standards. The tailpipe must be constructed of seamless or electrically welded tubing that is at least 16-gauge steel or its equivalent.

  (b) The size of the tailpipe as received from the manufacturer may not be altered.

  (c) The furthest point of the tailpipe may be flush with, or must not extend more than one (1) inch beyond, the perimeter of the body for side-exit pipe or the bumper for rear-exit pipe. The exhaust system must be designed such that exhaust gas will not be trapped under the body of the bus.

  (d) A one (1) piece bellows-type pipe that extends from the manifold to the muffler may be used in the exhaust system. (State School Bus Committee; 575 IAC 1-9-32; filed Aug 15, 2014, 10:20 a.m.: 20140910-IR-575130244FRA)