Flowmaster’s 40 Series Delta Flow Mufflers produce a loud and aggressive sound on the outside of your vehicle while maintaining a quieter sound on the inside. The Flowmaster Delta Flow Series out does the basic 40 Series Mufflers by using three internal baffles precisely placed in the case and weld to exact specifications. Along with the precision welding these mufflers out-scavenge and provide superior exterior sound reductions than the regular 40 Series mufflers. With a Flowmaster 40 Series Delta Flow you can achieve all this while realizing improved torque, horsepower, and the famous Flowmaster sound.