SoundFX™ Steel Round Aluminized Exhaust Muffler (17842) by Walker®. Optional. Muffler Inlet Diameter: 2.5″. Muffler Outlet Diameter: 2.25″. Muffler Body Length: 25″. Muffler Overall Length: 32.5″. Muffler Configuration: Offset – Offset. This muffler is the right choice if you opt for quality acoustics and performance. Walker offers 100% aluminized steel universal fit SoundFX Mufflers designed to maintain a quality appearance and agreeable exhaust tone.