PERRIN boost tubes are CNC mandrel bent from aluminum tubing for better weight reduction. Perrin Subaru STi 15-21 FMIC Red Boost Tubes w/ Black Silicone Couplers every boost tube has an over sized beaded end to ensure the hose clamps and couplers stay connected and sealed! We choose to take the smoothest shortest path to get air to and from the intercooler. Right off the turbo a smooth offset coupler carries the hot side air charge to a perfectly matched 2.25” boost tube. We chose 2.25" tubing for a smoother, cleaner, obstruction free routing while still being large enough to flow more WHP than most turbos can put out. The air charge then is routed through the engine bay next to the battery, and down behind the radiator to the intercooler. The cold side boost tubes are mounted as high as possible in the engine compartment to clear all turbo and intake combinations as it travels to the throttle body through the engine bay.
 
Features:
Finish Wrinkle Powdercoat Red
Boost Tube Construction Mandrel Bent Aluminum
Includes coolant expansion tank and coolant overflow tank in a black powder-coated finish
2.25 inch Diameter Piping
Mandrel Bent Lightweight Aluminum Tubing
Beaded End to Ensure Hose Clamps & Couplers Stay Connected and Sealed
Core NOT Included
Difficult Installation Effort
Installation Guide
No Tuning Required
 
The Perrin Front Mount Intercooler (FMIC) kits for the 2015-2021 STI are massive upgrades. The full Perrin FMIC kit is designed for big horsepower applications! These are intercooler pipes designed to work with the PERRIN Performance Front Mount Intercooler
 
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