OEM, as in Original Equipment Manufacturer stands for companies who make the original parts for car factories. These pars are the same or exceeding quality as the original parts on the car. These parts are thus suitable for everyday driving and trackdays.
OEM lifters are suitable for performance applications as well, because most of the time the stresses and effects of valvetrain modifications dont affect lifters that drastically. We also offer performance lifters, but OEM products come at a lighter pricetag.