Straight - through flow path. Exclusive expansion chamber dissipates annoying mid - range drone. Flows up to 201 better than stock. Authoritative, but never overpowering, exhaust sound. Polished - stainless steel. 4 inch diameter inout. Monster Exhaust Benefits. Replacing the restrictive stock muffler with Banks free - flowing Monster muffler makes a huge difference in airflow, sound and performance. The Banks muffler has a large inlet and outlet. And in between, the exhaust flows straight through, instead of torturously winding its way back and forth inside hairpin chambers and building up back - pressure. And only Banks Monster muffler has an expansion chamber to alleviate the nasty drone that other straight - through mufflers are known for. Banks utilizes durable ceramic packing with a high temp rating so it won't degrade like fiberglass. Add it all together and you get a muffler that flows over three times better than stock and delivers a pleasing, throaty rumble