BELEY Exhaust Back Pressure Tester Kit — 2.5in Dual Gauge, M12/M18 Adapters & 57in Heat-Resistant Hose

The BELEY Exhaust Back Pressure Tester Kit is a professional diagnostic gauge set that measures exhaust backpressure to help locate clogged catalytic converters and mufflers.

Designed for technicians, auto dealers and experienced DIY mechanics, this kit provides a fast, visual way to check whether exhaust restriction is causing poor acceleration, overheating or engine sluggishness. The 2.5-inch dual-unit gauge reads PSI and Bar, uses a three-color band for immediate interpretation, and includes M12 and M18 adapters plus a heat-resistant 57-inch silicone hose so you can test from the driver’s seat.

How does the gauge show if a catalytic converter is blocked?

The gauge displays exhaust backpressure in PSI and Bar and highlights safe and problematic ranges using color bands. At idle and higher RPM you can compare readings to typical thresholds to decide whether the exhaust flow is within acceptable limits.

• 2.5-inch dial with PSI/Bar dual units and color-coded green, yellow and red zones
• Idle guideline: ≤1.25 PSI (0.09 Bar); 2500 RPM guideline: ≤3 PSI (0.21 Bar)
• Red zone indicates elevated backpressure that warrants further inspection or repair
• Factory-calibrated gauge; pointer can be manually reset to zero after shipping

What adapters and hose options are included for real-world testing?

The kit ships with threaded M12 and M18 adapters to fit common exhaust ports and sensor bungs. A long, heat- and abrasion-resistant silicone hose lets you drop the gauge inside the cabin while connecting to the exhaust, making testing easier and safer.

• M12 and M18 thread adapters for broad fitment across modern vehicles
• 57-inch (about 5 feet) silicone hose rated for high temperatures (up to 300°C)
• Thickened rubber construction for durability and abrasion resistance
• Drop-resistant rubber cover on the gauge for shop and roadside use

How do I interpret readings during different driving conditions?

Take measurements at idle and under load (for example at 2500 RPM) to see how backpressure changes with engine speed. Compare numbers to the kit’s suggested thresholds; consistent readings in the red zone indicate a restriction, while green shows normal flow.

• Measure at idle first to establish a baseline pressure
• Raise engine speed to 2500 RPM to observe pressure under load
• Look for sudden spikes or sustained high values as a sign of blockage
• Use the gauge’s color bands for a quick go/no-go assessment

What maintenance or setup steps ensure accurate measurements?

The gauge is factory-calibrated, but shipping can nudge the pointer; you can manually reset it to zero without affecting accuracy. Keep the hose and adapters clean, avoid kinking the silicone line, and store the kit in its protective case between uses.

• Reset the gauge pointer to “0” if it shifts during shipping
• Inspect the silicone hose for cuts or heavy abrasion before each test
• Use the correct adapter thread (M12 or M18) to prevent leaks at the fitting
• Protect the gauge with its rubber cover to extend service life

Who is this for: The BELEY Exhaust Back Pressure Tester Kit is built for professional mechanics, fleet maintenance technicians, used-car inspectors and knowledgeable DIYers who need a reliable, portable way to diagnose exhaust restrictions. It’s especially useful when you want a clear, repeatable measurement and a quick visual decision tool before disassembling the exhaust or replacing expensive components.