4" PRXB HIgh performance exhaust brake kit (air actuated) directmount comes with air tank/hose and accessory kit, standard transmission

 

Our Pressure Regulated Exhaust Brake (PRXB) offers the highest retarding power for the lowest price available. Although the PRXB’s retarding power is comparable to that of a compression release engine brake, the manufacturing and installation costs are significantly less.

Conventional exhaust brakes experience a reduced exhaust back pressure at low engine speeds, resulting in an unnecessary loss of braking power. Pacbrake's innovative PRXB addresses this issue with a patented wastegate design that regulates exhaust back pressure as engine speed changes. The valve maintains near constant engine backpressure throughout the entire RPM range, providing maximum exhaust braking power at all times.