How might a high flow exhaust modification affect the EGR system?

A high flow exhaust modification generally leads to a reduction in back pressure within the exhaust system. This is important for the EGR (Exhaust Gas Recirculation) system because it relies on specific pressure levels to function effectively. With reduced back pressure, the EGR valve may not operate correctly, potentially leading to insufficient exhaust gas being recirculated into the intake manifold. This can impact engine performance and emissions. Therefore, one of the most significant effects of modifying the exhaust system to allow for high flow is the potential for low back pressure, which directly impacts the efficiency and operation of the EGR system.

While excessive heat can be a concern in some scenarios where exhaust flow is increased, and little exhaust flow doesn’t typically apply when dealing with high flow systems, the primary and most direct impact of modifying to a high flow exhaust is indeed the reduction in back pressure, affecting EGR performance.