PERRIN Front Mount Intercooler Boost Tube Kit – 2015–2021 Subaru STI (VA) | Red | FMIC Charge Pipe Kit

The PERRIN Front Mount Intercooler Boost Tube Kit for the 2015–2021 Subaru STI (VA chassis) is a complete charge pipe kit engineered to connect a front mount intercooler (FMIC) to the VA STI's EJ257 turbocharger outlet and throttle body inlet — providing the complete intercooler piping solution required for a front mount intercooler installation on the VA STI platform. Finished in PERRIN's signature red powder coat, the boost tube kit is a direct-fit solution for VA STI owners who have installed or are installing a front mount intercooler and need the correct charge pipes to complete the FMIC system. PERRIN Performance is one of the most respected Subaru performance brands in North America — with deep VA STI development experience and a product lineup trusted by Subaru enthusiasts from street performance to full competition builds.

Key Features:

• Complete FMIC charge pipe kit — all required boost tubes and charge pipes to connect a front mount intercooler to the VA STI's turbocharger outlet and throttle body inlet — a complete piping solution for the FMIC installation
• Red powder coat finish — PERRIN's signature red powder coat — a clean, purposeful appearance under the hood that identifies the PERRIN system and complements a performance-oriented engine bay
• VA STI specific — engineered for the 2015–2021 Subaru STI VA chassis — correct dimensions, routing, and connection points for the VA STI's engine bay layout
• Direct-fit — engineered for correct fitment in the VA STI engine bay — no fabrication or modification required for a complete FMIC piping installation
• Boost leak resistant — quality construction and correct fitment minimize boost leak risk at all connection points — critical for maintaining boost pressure and EJ257 reliability
• PERRIN quality — manufactured by PERRIN Performance, one of the most respected Subaru performance brands in North America with extensive VA STI development experience

What This Kit Is and What It Requires:

This is the charge pipe (boost tube) kit only — the front mount intercooler core is not included. The PERRIN boost tube kit provides the piping that connects the FMIC to the turbocharger and throttle body — it is the required companion to a front mount intercooler core for a complete FMIC installation on the VA STI. If you are building a complete FMIC system, you will need both an FMIC core and this boost tube kit. PERRIN and other manufacturers offer VA STI-specific FMIC cores separately — verify that your chosen FMIC core is compatible with the PERRIN boost tube kit before ordering. A professional tune is strongly recommended after FMIC installation to optimize boost, fuelling, and timing for the improved charge air temperatures.

Why FMIC on the VA STI?

• Factory TMIC Limitation: The 2015–2021 Subaru STI uses a top-mount intercooler (TMIC) positioned under the hood scoop. The TMIC's limited core volume becomes heat-soaked under sustained boost and high-load driving — IATs rise, charge density drops, and the ECU pulls timing to protect the EJ257. Heat soak is the primary performance limitation of the factory TMIC on the VA STI platform and the reason FMIC upgrades are one of the most popular modifications for serious VA STI builds.
• FMIC Advantage: A front mount intercooler positions the core in the front bumper opening for maximum ambient airflow exposure — dramatically larger core volume and superior cooling capacity compared to the factory TMIC. The result is consistently lower IATs under sustained boost, denser charge air, more consistent power delivery, and the ability to maintain timing advance that the ECU would otherwise pull under heat-soaked TMIC conditions.
• Charge Pipe Importance: The boost tube kit is the critical link between the FMIC core and the engine — the charge pipes must be correctly sized, correctly routed, and correctly sealed to maintain boost pressure from the turbocharger through the intercooler to the throttle body. Any boost leak in the charge pipe system results in boost loss, poor performance, and potential EJ257 reliability issues from lean conditions. PERRIN's direct-fit boost tube kit eliminates the fitment and boost leak risks of fabricated or generic charge pipe solutions.

Colour Options:

The PERRIN FMIC boost tube kit for the VA STI is available in multiple colour options — red (this product, PERPSP-ITR-438-3RD) and other colours. The red powder coat is PERRIN's signature colour — a clean, purposeful appearance that is immediately recognizable as a PERRIN system. If you prefer a different colour, verify the correct PERRIN part number for your preferred colour option before ordering.

Specifications:

• Brand: PERRIN Performance
• Part Number: PERPSP-ITR-438-3RD
• Barcode: PSP-ITR-438-3RD
• Colour: Red powder coat
• Kit Type: Front mount intercooler boost tube / charge pipe kit
• Application: 2015–2021 Subaru STI — VA chassis — EJ257
• Weight: 27.7 lbs (shipping weight)

Fitment Information:

• 2015–2021 Subaru STI — VA chassis — EJ257 turbocharged boxer four
• Engineered for use with a front mount intercooler on the VA STI — verify compatibility with your specific FMIC core before ordering
• Note: FMIC core not included — must be sourced separately. Verify FMIC core compatibility with the PERRIN boost tube kit before ordering. Not compatible with the WRX (FA20DIT) without separate fitment confirmation — this kit is STI (EJ257) specific. A professional tune is strongly recommended after FMIC installation. Professional installation by an experienced Subaru performance shop strongly recommended.

What's Included:

• PERRIN FMIC boost tube / charge pipe kit — red — 2015–2021 Subaru STI VA (PERPSP-ITR-438-3RD)
• All required couplers, clamps, and mounting hardware
• Refer to PERRIN's product documentation for complete kit contents
• FMIC core not included — must be sourced separately

Installation Notes:

• Professional installation by an experienced Subaru performance shop strongly recommended — FMIC charge pipe installation requires correct routing, correct clamp torque, and thorough boost leak testing after installation
• Verify all boost tube connections and clamps for boost leaks after installation — any boost leak between the turbocharger and throttle body will cause boost loss and poor performance. A boost leak test (pressurizing the intake system with the engine off) is strongly recommended before the first boosted drive.
• A professional tune is strongly recommended after FMIC installation — the improved charge air temperatures will change the EJ257's fuelling and timing requirements. Running the factory map on a tuned FMIC setup leaves significant performance on the table.
• Verify FMIC core fitment and clearance in the VA STI front end before finalizing the charge pipe routing — the boost tube routing is dependent on the FMIC core's position in the front bumper opening
• Check all connections for boost leaks after the first heat cycle — thermal expansion can affect clamp tension on initial use

Why PERRIN Performance?

PERRIN Performance is one of the most respected Subaru performance brands in North America — known for their intake systems, intercoolers, boost tube kits, suspension components, and engine accessories for Subaru WRX and STI platforms across multiple generations. PERRIN has been developing performance products for the Subaru STI since the platform's introduction in North America — and their VA STI FMIC boost tube kit reflects that deep platform-specific development experience. For VA STI owners who want a quality, direct-fit FMIC charge pipe solution from a brand that genuinely understands the EJ257's performance requirements, PERRIN is the correct choice.

Perfect For:

• 2015–2021 Subaru STI (VA) owners installing a front mount intercooler who need the correct direct-fit charge pipe kit to complete the FMIC system
• VA STI builds targeting higher boost pressures, larger turbochargers, or E85 where a complete, correctly-fitted FMIC piping solution is required alongside the FMIC core
• Owners who want PERRIN's direct-fit boost tube kit to eliminate the fitment and boost leak risks of fabricated or generic charge pipe alternatives
• VA STI builds where PERRIN's red powder coat charge pipes complement a PERRIN-themed or red-accented engine bay

Note: Charge pipe kit only — FMIC core not included and must be sourced separately. Verify FMIC core compatibility before ordering. STI EJ257 specific — not compatible with WRX FA20DIT without separate confirmation. Boost leak test strongly recommended after installation. Professional tune strongly recommended after FMIC installation. Professional installation recommended.