ProPower Diesel 5" Muffler - By Donaldson. This muffler is a straight through design that reduces drone without increasing backpressure or reducing horsepower. It is a direct bolt-in replacement for the midpipe on 5" Exhausts for Ford, Dodge (Ram), and Chevy trucks and fits with all exhaust systems from ProPower Diesel, MBRP/P1, FloPro, and Jamo without any cutting.