AEM performs tests to measure vehicle power on a dynamometer before and after
an air intake is installed. Our air intake horsepower claims are based on the
results of specific or similar vehicle testing. Sometimes an air intake will
fit several vehicles or different years of the same model. In these cases it
is not practical to test every application so our horsepower claims are based
on similar vehicles where we believe the horsepower gains are reliable.
Horsepower measurements can vary some from day to day due to environmental
conditions, the dynamometer used, and the vehicle’s on-board computer
adjusting to changing air flow or environmental conditions. While some
variations do occur from vehicle to vehicle we feel that our published air
intake horsepower gain numbers provide a good measure for what the average
vehicle can expect to gain with a specific air intake.