For an engine as powerful as the 572, Flowmaster would commonly recommend 31/2-inch-or-larger dual exhaust. The new Super 40s are so efficient at getting spent exhaust gases out of the engine that we only lost 3 peak horsepower going from open headers to 3-inch Super 40s. For our initial test, the engine baselined with open headers at 651 hp, and we only gave up about 3 hp to 648.5 with full 3-inch exhaust.
The new Flowmaster Super 40s are offered with 21/4-inch, 21/2-inch, and 3-inch inlet and outlet sizes in all offsets. Also available are dual outlets on the 21/2 and 3-inch models. The Super 40s offer the most aggressive, deepest-sounding street two-chamber ever released by Flowmaster.
The Flowmaster Super 40 5x10-inch case is modeled after the Top Ten Street/Race muffler. For our ZZ572 dyno-testing, we used a 3-inch Flowmaster exhaust system and Super 40 mufflers. To learn more about these hot-sounding and free-flowing new mufflers, visit www.flowmastermufflers.com