Description
HKS Hi-Power SPEC-R Exhaust - 2004-2007 Subaru Impreza WRX STI
Product Overview: HKS Hi-Power SPEC-R Exhaust - 2004-2007 Subaru Impreza WRX STI is an exhaust-system component engineered to improve exhaust flow and deliver HKS-specific sound and packaging. This listing is structured around the exact HKS product/SKU so shoppers can match the component to the intended vehicle or build without relying on a generic product-family description.
Driver Benefit: A freer-flowing exhaust can reduce restriction downstream of the engine while giving the driver a more purposeful exhaust note and a performance-oriented appearance.
Recommended Use: Best suited to street and track-oriented builds seeking an exhaust upgrade without changing unrelated engine systems.
Technical & Fitment Notes
- Confirm piping/tip configuration, emissions-equipment compatibility, and any trim or drivetrain-specific fitment notes for the exact HKS part number.
- Exhaust sound and cabin presence vary with the rest of the exhaust system, engine configuration, and vehicle modifications.
- Original catalog note: Note: For applied model E, F. Fits to "SPEC-C". Tip Diameter (mm): 120 Pipe Size: 75 Sound, layout, exhaust performance, detailed finish of manufacturing. It is a real sport muffler. Hi-Power Spec R mufflers are designed for no compromises whilst still maintaining a reasonable noise level for street use. In the pursuit of absolute efficiency, a one piece design was utilized and titanium was chosen as the preferred material due to it its incredible lightweight properties and durability against the weathering and long term use. Hi-Power Spec R mufflers are on average 65% lighter than the manufacturer's standard muffler system and the single piece design reduces the inefficiencies that can be found at joints whilst allowing for the straightest possible design. - Each part is reviewed to lighten its weight. It achieves 65% lighter than stock exhaust system. - There is no gap at flange portio
Fitment and specifications can vary by HKS part number, model year, trim, transmission, drivetrain, and market. Confirm the SKU and application before ordering, particularly on modified vehicles.