Aluminized steel construction for corrosion resistance and durabilitySpun-locked heads for rupture resistanceTube-and-partition style interior designMechanical interior joints for durabilitySpot welded bushings provide stability and system supportSoundFX mufflers are engineered with 100% aluminized steel for longer service life compared to low carbon steel. These mufflers have mechanical interior joints for durability, and spun-locked heads for resistance to rupture from backfires. SoundFX mufflers are available in direct fit and universal styles, both with quality appearance and favorable acoustics.