By re-directing a controlled flow of hot exhaust into the intake, the Mazda Miata EGR Valve secures the engine as well as the planet, chopping down nitrogen oxides whilst retaining full engine power on demand. The reason why owners are praising the part, which is going to bolt directly onto all NA, NB, NC, and ND Mazda Miata roadsters, is that each generation has the same cool-burn advantage without loss of that familiar quick-revving character. When the engine is cruising softly, the valve opens to allow approximately ten percent of inert gas to absorb the heat to prevent the occurrence of knock and also to provide greater fuel economy, but it closes at idle, cold start, or wide-open throttle to provide sharp acceleration. It is placed between the exhaust plenum and the intake plenum and has stainless passages to manage the heat that could melt normal hardware and its internal thermal regulation keeps recirculation within a safe range of five to fifteen percent even during switchbacks on the mountain and track days. The early Mazda models applied a primitive vacuum diaphragm, mid-cycle improvements featured self-adjusting backpressure circuits, and the recent models have an electronically controlled EGR Valve with a stepper motor and position feedback to provide laser-precise flow control. The updates imply excellent reliability, reduced check-engine lights, and extend the life of the catalyst, and the Mazda-made corrosion-resistant body and high-temperature graphite gasket cope with carbon accumulation and leakage even after decades of spirited Miata performance. Commuters feel a slight increase in mileage, weekend race cars enjoy cooler burning that allows timing to be advanced safely and all citizens enjoy reduced tailpipe emissions and know that this proven EGR Valve is a silent but very important device that takes care of efficiency, performance and safety.
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