Remarkable Power RK7561 Semi Direct Fit Exhaust Flange Repair Flex Pipe Replacement Kit Brand New Flex Pipe Flex Pipe Inlet Diameter: 2.4" , Total Length: 5.6",Body Length:3.75" Maximizing smoothest exhaust airflow, for more details see "Product Description" Increase engine output and efficiency. Gain 10 - 15 HPs (approximately)