Or, you could do like some, dissasemble the muffler and drill all the baffle holes out a couple thousandts. Next time a noisey muffler jumps off a car for no apparent reason make sure you get a chance to look at it. I cant believe no one has ever insisted on checking the hole size in the baffles of these mufflers with a wire gauge.
What Rule Book Says:
A. Exhaust systems must be designed to create a minimum fire hazard and a
minimum hazard to other competitors.
B. Exhaust system must extend outside of engine housing.
C. Exposed portions of exhaust system must not be higher than the rear tire.
D. Exhaust system must not extend outside of a straight edge extended from
rear edge of rear tire and rear of the rear bumper.
E. Exhaust systems facing forward must not extend outside of nerf bar.F. Drilling holes in the baffles is prohibited. Inside seam of baffle must be straight,
although seams may not be parallel in baffle) A nut or washer welded onto
muffler flange is allowed for safety wiring.
G. All classes must use a tailpipe and muffler combination
conforming to technical manual specifications. Muffler must retain the threaded
flange on Honda exhausts.
H. Clamps should be positioned with screw adjustments, bolts and excess strap
material facing inboard when possible.
I. Exhaust system must be intact at scales. If any part comes off during race and
not replaced before the checkered flag the car will be disqualified at the scale. No
repairs after checkered flag is waved.
J. All exhaust must pass through the mufflers.