SKU: 3306-RA073
HKS Inner Silencer 94mm for Subaru WRX STI 2008-2021
The HKS Inner Silencer 94mm installs inside compatible HKS mufflers to lower cabin noise from exhaust drone. It fits 2008-2021 Subaru WRX STI models with HKS 94mm inlet mufflers like Hi-Power Spec L and Silent series. Drivers keep full exhaust flow and horsepower while gaining quieter highway cruising.
Key Features
- 94mm Precise Fit: Matches HKS muffler inlets exactly for secure installation without gaps or leaks.
- SUS304 Stainless Steel: Resists corrosion and heat for years of reliable performance in harsh conditions.
- Targeted Noise Control: Absorbs low-frequency drone at cruising speeds without adding backpressure or power loss.
- Removable Design: Pull out for unrestricted sound on track days then reinstall for street use.
- Included Band Clamp: Stainless steel clamp ensures tight seal and vibration-free hold.
Product Notes
- Confirm your HKS muffler has 94mm inlet pipe before purchase.
- Reduces sound levels to meet local noise regulations where required.
- Lightweight at 0.8 lbs for simple handling and shipping.
Installation Notes
- Professional installation recommended.
- Slide into muffler inlet pipe and tighten band clamp to 8-10 Nm torque.
- Compatible with all HKS mufflers using factory hardware.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2021 | Subaru | Impreza WRX STI | All |
| 2009-2020 | Nissan | GT-R | Premium/Base |
Why Choose HKS?
- Over 50 years developing exhaust systems for JDM performance cars.
- Manufactured in Japan with strict quality controls.
- Components tested in Super GT racing for real-world durability.
Frequently Asked Questions
- Q: Does this fit non-HKS mufflers?
A: No only designed for HKS mufflers with 94mm inlet pipes such as Hi-Power and Silent Hi-Power models. - Q: What material construction?
A: Made from SUS304 stainless steel for heat and corrosion resistance. - Q: Does it affect horsepower?
A: No maintains open exhaust flow with dyno-tested zero power loss.
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Original HKS box approx 4.3 x 4.3 x 11.8 inches
- Weight: 0.8 lbs
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