What does a backpressure reading of greater than 2.75 psi indicate?

A backpressure reading greater than 2.75 psi is indicative of restricted exhaust flow. This reading signifies that there is an obstruction in the exhaust system, which can lead to various performance issues for the engine. When exhaust gases cannot flow freely, it can cause the engine to struggle, resulting in decreased power output, higher temperatures, and inefficient fuel combustion.

A reading in this range typically prompts technicians to investigate the exhaust system for blockages such as a clogged catalytic converter, damaged muffler, or collapsed exhaust pipes. It is crucial to maintain optimal exhaust flow for proper engine efficiency and performance, as excessive backpressure can have cascading negative effects on the vehicle's overall operation.