The Walker Mega-Flow muffler from Tenneco offers a fuel-efficient, cost-effective exhaust solution for a full range of heavy-duty fleets. Utilizing an open-style design with high-strength OCF roving, the Mega-Flow muffler improves fuel efficiency without impacting acoustics. Specifically designed for class 7 and 8 trucks, the Mega-Flow muffler combines the Walker brand's traditional focus on premium quality with cutting-edge ultra-high-flow technology to reduce system back-pressure by as much as 30 percent for increased fuel economy.