When your upgrading to a larger turbo or driving the car hard it is important keep the air charge as cool as possible. Even though the stock intercooler is able to flow sufficent air, it is still only designed for mild driving and stock power levels.
When pushing the car hard, the stock intercooler will heat soak quickly and take a long time to cool back down. This causes the performance of the motor to decline and power to suffer. The Process West intercooler is a direct factory replacement, that features a larger then stock core, and lower pressure drop. These 2 features previously stated allow the intercooler to flow more air while reducing the amount of pressure that is lost over the surface of the intercooler. These features allow the intercooler to work better for longer, and also allow a larger amount of air to pass through the core.