SKU: 31029-AF001 | UPC: 4957266918685
HKS SUPER TURBO MUFFLER GDB(E-G) 2004-2007 Subaru Impreza WRX STI
The HKS Super Turbo Muffler GDB(E-G) is a full titanium cat-back exhaust system built for Subaru Impreza WRX STI GDB chassis models from 2004 to 2007. This direct-fit replacement enhances exhaust flow for quicker turbo spool quicker throttle response and measurable power increases up to 14PS over stock. Its design amplifies the raw turbocharger whistle and blow-off sounds while maintaining track-ready volume levels.
Key Features
- Titanium Construction: Full titanium muffler weighs just 7.2kg versus stock 17.5kg for reduced rear weight and improved handling balance
- Large Diameter Piping: Mandrel-bent φ60.5-80.0mm pipes with 80mm tips promote high-RPM flow and prevent restriction under boost
- Turbo-Focused Sound: Internal chamber tuning emphasizes spool-up whine and wastegate flutter for authentic JDM rally sound
- Compact Dimensions: Muffler measures 500mm L x 400mm W x 290mm H fits cleanly under STI sedan body without ground clearance issues
- Bolt-On Design: Uses factory hangers and flanges for straightforward replacement on GDB STI models
Product Notes
- Requires no ECU tuning for installation though dyno tuning recommended for maximum gains
- Clean exhaust tips regularly to prevent carbon buildup and maintain appearance
- Ships fully assembled with all necessary gaskets and hardware included
Installation Notes
- Professional installation recommended.
- Remove stock cat-back from mid-pipe flange rearward lift and bolt in HKS unit
- Compatible with factory mounts no cutting or welding required
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004-2007 | Subaru | Impreza | WRX STI |
| 2004-2007 | Subaru | Impreza WRX | STI Type RA-R |
| 2004-2007 | Subaru | Impreza WRX | STI spec C |
Why Choose HKS?
- HKS pioneered Japanese aftermarket tuning since 1973 with motorsport-proven designs
- Every exhaust undergoes rigorous dyno and sound testing for consistent results
- Precision TIG-welded joints ensure durability under high-heat high-boost conditions
Frequently Asked Questions
- Q: Will this fit my 2005 USDM Subaru STI?
A: Yes direct bolt-on fit for all 2004-2007 Impreza WRX STI GDB chassis including USDM JDM and AUS models - Q: What material is the muffler made from?
A: Full titanium body with SUS304 stainless piping for heat resistance and lightweight performance - Q: What is the warranty on this muffler?
A: HKS offers a 1-year limited warranty against manufacturing defects when installed by certified shop
Shipping & Handling
- Method: Ground shipping via UPS or FedEx
- Availability: In stock – ships same or next business day
- Packaging: Original HKS double-wall box measures 24in x 20in x 16in
- Weight: 35 lbs shipping weight
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