Exhaust Sound and Flow The resonator delete kit replaces the stock resonator found in 2011 to 2014 F - 150 trucks, freeing the exhaust path and increasing sound. CNC Machined Donut Connection CORSAs machined stainless steel donut connection was designed exclusively to match the unique needs of the Ford F - 150 exhaust system to create a precision fit with no exhaust leaks. Laser Cut 38 in. Stainless Flange CORSA designed a flange with unmatched fit and durability to withstand the abuse of daily travel. Easy Installation and Fitment F - 150 resonator delete kits bolt directly onto CORSA exhaust systems and stock F - 150 systems.