2X 4" x 2.5" x 6" Universal Silencer Exhaust Stainless Steel Back Box Muffler
4"x2.5"x6” 12" Long Universal Silencer Exhaust Resonator Stainless Steel 304 Back Box. -Middle section is straight-through and silencer, and the effect of reducing resonance is remarkable. 2x Car Exhaust Muffler.