Designed to improve airflow and prevent collapsing common with the stock corrugated turbo inlet hose, the APS 08-10 Subaru STI turbo inlet pipe, or "Compressor Inlet Duct," is a great solution for your turbo Suby. Because of the limited space beneath the STI intake manifold, turbo inlet hoses have typically been constructed of silicone. APS has designed their thin-walled stainless steel inlet pipe to fit under the stock intake manifold and offer the maximum possible internal diameter for optimal air flow. The steel construction of the APS turbo inlet completely alleviates the risk of the pipe collapsing under suction.

The entry hose to the APS Compressor Inlet Duct features silicone construction with bellows to allow for engine movement, and has an internal diameter that is the same size as the pipe's outer diameter for unrestricted airflow. In addition, the APS STI turbo inlet includes 3" and 2.4" turbocharger couplers, so it can be used with a stock or aftermarket turbo with an oversized inlet, so you don't need to buy a new inlet when you upgrade turbochargers.