Upgrade your Isuzu truck's braking performance with this heavy-duty exhaust brake unit and gasket set, specifically designed for NQR, NRR, and NPR models with 4HK1 5.2L and 4HE1 4.8L engines from 1995-2007. The package includes two precision-engineered mounting gaskets with reinforced perforated design for optimal sealing. The integrated vacuum actuator and butterfly valve mechanism work together to create effective engine braking, reducing wear on your service brakes during downhill operations and extending brake life. This complete assembly is built to meet original equipment specifications for reliable performance and straightforward installation.