Pro Exhaust Backpressure Kit 
Take readings while road testing vehicle. Compare pressure ahead and behind suspected restriction, like a catalytic converter or muffler. Includes punch, 5/16"x1/2" self-tapping bolts, test adapter, 12/18mm fitting for oxygen sensor port, 8-ft. of heat resistant silicone tipped hose and 0-15 psi gauge.
Availability: In stock.