Flowmaster’s Super 44 Muffler uses the same Delta Flow Technology found in our larger Super 40 mufflers. The Super 44 delivers a powerful rich tone and is the most aggressive, deepest sounding, highest performing four-inch case street muffler we’ve eve built! Constructed from 16-guage aluminized or 409S Stainless Steel and fully MIG-welded for maximum durability. 4" Thick x 9.5" Wide x 13" Long with inlet/outlet sizes from 2" up to 3". Click on image for sizes and full part number listing.