After experimental investigation and simulation for the Bajaj 4S champion muffler with different modifications like
reflective, absorptive and hybrid type for noise reduction it is concluded that the values of noise level and fuel consumption
for hybrid type modification lies between reflective and absorptive type muffler. By placing the baffles at optimum distance from fixed wall for the reflective type muffler the minimum noise level can be achieved. The reflective muffler
with baffles is the better design amongst the four designs studied as it achieves a balance between sound pressure level
and fuel consumption.