ABSTRACT: Over the past few years. changes have been observed in the behavior of typical performance curves. after higher technology has been incorporated into the agricultural tractor engines. either to satisfy the ceiling of the new pollutant gas emission limits or to achieve better efficiency. https://www.roneverhart.com/2003-2005-HONDA-ACCORD-2-4L-4-Cylinder-Engine-Upper-Intake-Manifold-OEM/