(a) A motorboat designed and intended solely for racing need not have a whistle or other sound-producing mechanical appliance or a bell as required by Section 31.065 of this code or a fire extinguisher as required by Section 31.067 of this code while competing in a race or while engaged in navigation that is incidental to tuning up for a race conducted in accordance with the provisions of this chapter.
(b) A racing craft engaged in a race sanctioned by the governing board of any public water of this state need not have an exhaust water manifold or factory-type muffler installed on the engine as required by Section 31.070 of this code if written permission is granted by the governing board of the water body.