For 3 Series F30 E90 E92 2.5" Inlet Exhaust Muffler Resonator Deep Tone 12" Long
Car Resonator. 1 x Mufflers Resonator (No Instruction). The middle section is straight through and muffler, and the effect of reducing resonance is remarkable. Designed to dampen exhaust noise, facilitates unobstructed exhaust flow.