SKU: 14019-AF002 | UPC: 4957266610183
HKS 2008-2014 Subaru WRX STI EJ25 SUH409 Turbo Exhaust Manifold
The HKS SUH409 Turbo Exhaust Manifold replaces the restrictive factory unit on 2008-2014 Subaru WRX STI models with EJ25 engines. Crafted for twinscroll turbochargers like GT2860R Gen II and larger, this manifold delivers smoother exhaust flow for quicker spool times and higher power output across the RPM range. Direct bolt-on design ensures easy upgrade for enthusiasts chasing track-ready performance.
Key Features
- SUS409 Stainless Steel Casting: Heat-resistant 409-grade stainless withstands extreme temperatures and corrosion for long-term durability in high-boost applications
- Equal Length Runners: Precisely tuned runner lengths minimize exhaust pulses for even flow, reducing backpressure and improving turbo efficiency
- Twinscroll Specific Design: Optimized divider matches STI twinscroll turbos, enhancing low-end torque and mid-range power delivery
- Thick Wall Construction: Reinforced walls prevent cracking under thermal stress, supporting 400+ whp builds
- High-Flow Collector: Large diameter outlet accelerates exhaust gases to the turbine, cutting lag and boosting top-end horsepower
Product Notes
- Pair with HKS downpipe for complete exhaust flow gains
- Inspect turbo mounting studs during install. replace if damaged
- Handle with care to avoid cosmetic scratches on cast finish
Installation Notes
- Professional installation recommended.
- Requires stock turbo removal and new gaskets. HKS gasket kit 14020-AF001 sold separately
- Bolts directly to factory turbo and engine mounts with provided hardware
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2014 | Subaru | Impreza | WRX STI Sedan |
| 2008-2014 | Subaru | Impreza | WRX STI Hatchback |
| 2015-2018 | Subaru | WRX STI | Sedan |
| 2015-2018 | Subaru | WRX STI | Hatchback |
| 2019-2021 | Subaru | WRX STI | Sedan |
Why Choose HKS?
- Motorsport-proven designs from Super GT and rally programs
- Japanese manufacturing with rigorous quality testing
- Engineered for Subaru EJ25 architecture with dyno-validated gains
Frequently Asked Questions
- Q: Does this fit 2004-2007 STI models?
A: No, this 14019-AF002 is designed for 2008+ USDM WRX STI with updated EJ257 turbo positioning. earlier models use HKS 14019-AT001 - Q: What material is used for the runners?
A: Cast SUS409 stainless steel throughout, offering better heat retention and strength than tubular mild steel alternatives - Q: What warranty covers this manifold?
A: HKS provides a 1-year limited warranty against manufacturing defects when installed by certified shops
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Securely boxed with foam protection, approx 20x15x12 inches
- Weight: 28 lbs shipping, 28.2 lbs product
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