A key to making more power on any turbocharged engine is the addition of a high performance air-to-air intercooler. This part in the simplest of terms, cools the air going from the turbo into your engine, much the same as a radiator cools the water inside the engine, by transferring the excess heat way using multiple passages through a core. A PERRIN intercooler fits easily to the front of your Subaru to maximize cooling.
The OEM charge pipe on the FA20 DIT engine is restrictive, narrows down in certain points, and has pleats that make for uneven airflow. The PERRIN Charge Pipe has a perfectly smooth interior, constant radii, and gradual bends, making for much more efficient air delivery. All of his combined creates for increased intercooler efficiency.
*Pictures used for marketing purposes only, actual product may vary