Jones Exhaust F726-8D Full Boar Full Flow Truck Muffler 4 Inlet, 4 Outlet intercoolers A vacuum controlled butterfly valve

A vacuum controlled butterfly valve is utilized to improve flow at wide-open throttle while keeping things civilized and "drone" free throughout

7L V8 1989 - 1990 Chevrolet K2500 Cheyenne 305/5

6 V8 1957 - 1958 Chrysler Newport 392/6

4L/V6 2001 - 2005 Pontiac Aztek 3

Jones Exhaust F726-8D Full Boar Full Flow Truck Muffler 4 Inlet, 4 Outlet intercoolers A vacuum controlled butterfly valveOverview: Jones Exhaust Full Boar Full Flow Mufflers are specially designed for gas and diesel trucks. The straight through core design of these heavy duty mufflers provides maximum exhaust flow with boosts that increase acceleration and engine performance, especially under heavy loads. Features Specially designed to boost performance on gas and diesel trucks Straight through core design for maximized exhaust flow Increase engine performance under