Aftermarket exhaust parts and the engine. However, the pipes do "ring" with the exhaust pulses and increase underhood noise. Headers can be ceramic coated to reduce the heat radiated in the engine compartment, and to increase the temperature of the pipes which increases the velocity of the exhaust gases. Terminology: Catalytic converters are necessary to reduce emissions but create back pressure due to the exhaust gases being forced through a catalyst, and therefore decrease high-end engine power. Many modern catalytic converters only produce 1-3 psi of back pressure, though this restriction worsens further with use. Hi-flow catalytic converters can replace the standard units
Pollution Probe achieved the passage of mandatory vehicle emission testing in Ontario. In 2004, Pollution Probe helped to obtain further regulations in Ontario to reduce metal smelter facility emissions that can cause acid rain. In 2010, the organization helped to persuade the legislature to enact regulations to limit car and truck greenhouse gas emissions. In 2013, the organization collaborated with five power utilities to launch the Electric Mobility Adoption and Prediction ("EMAP") project. In 2016, Pollution Probe and Plug’n Drive issued a report with recommendations intended to increase sales and use of electric vehicles. In 2017, Pollution Probe was appointed one of