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SKU: 31029-AF013 | UPC: 4957266922170
HKS SUPER TURBO MUFFLER 2015-2021 Subaru WRX STI (EJ20) Catback Exhaust
The HKS Super Turbo Muffler catback exhaust system replaces the stock setup from the catalytic converter back on 2015-2021 Subaru WRX STI models with EJ20 engines. This full titanium and stainless steel system delivers measurable power gains and a deep aggressive exhaust note while shedding significant weight. Drivers experience sharper throttle response and enhanced turbo spool from the high-flow design.
Key Features
- Lightweight Build: 12.0 kg total weight versus 18.5 kg stock for 35% reduction improves handling and acceleration
- Power Increase: +14 PS at 5300 rpm and +11 Nm torque from optimized piping and muffler volume
- SUS304 Piping: Mandrel-bent 60.5-80 x 2 mm stainless steel pipes ensure durability and smooth exhaust flow
- Titanium Muffler Case: Jet-style semi-dual design with angled φ120 SUS304 tips provides distinctive turbo-inspired look
- Sound Tuning: Deep low-end tone rises to sporty roar at high RPM without cabin drone
Product Notes
- Special order item confirm stock before purchase
- Clean exhaust system regularly to maintain performance
- Oversized packaging requires freight carrier verification
Installation Notes
- Professional installation recommended.
- Bolt-on direct fit using factory mounting points no modifications needed
- Compatible with stock catalytic converter and hangers
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015-2021 | Subaru | WRX STI | All |
Why Choose HKS?
- 45+ years developing exhausts for Japanese performance cars
- Dyno and track tested for real-world gains
- Precision welded construction from premium materials
Frequently Asked Questions
-
Q: Will this fit my 2015-2021 Subaru WRX STI?
A: Yes direct bolt-on for all USDM and JDM VAB chassis STI models with EJ20 or EJ25 engines verify piping from catback rearward -
Q: What materials are used in construction?
A: SUS304 stainless steel for pipes and tips titanium for muffler case ensures heat resistance and longevity -
Q: What is the warranty and install process?
A: 1-year manufacturer defect warranty basic tools required 2-4 hours labor with lift
Shipping & Handling
- Method: UPS Freight Ground oversized
- Availability: In stock - ships same or next business day
- Packaging: Secure cardboard box 58 x 16 x 16 inches
- Weight: 26.4 lbs product 32 lbs shipping
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