Invidia [15-21 WRX] [15-21 WRX STI] Q300 Single Cat-Back Exhaust

The Invidia Q300 Single Cat-Back Exhaust for the 2015-2021 Subaru WRX and WRX STI delivers the Q300's signature deep, refined tone in a lightweight single-exit layout. Built from polished SUS304 stainless steel with 3-inch (76mm) mandrel-bent piping, a resonated mid pipe with flex section, and an Advantex-lined flat-bottom muffler, it frees up exhaust flow for stronger horsepower and torque while keeping cabin drone in check. A single 4-inch (101mm) rolled slant-cut stainless steel tip finishes the system with a bold, motorsport-inspired look. New gaskets and hardware are included, and hangers welded onto the OEM locations make installation a direct bolt-on.

• Fits 2015-2021 Subaru WRX and WRX STI (VA chassis)
• Q300 single-exit design - quieter and more refined than R400/N1, still deep and sporty
• 3-inch (76mm) polished SUS304 stainless steel mandrel-bent piping; resonated mid pipe with flex section
• Advantex-lined flat-bottom muffler for high-flow performance with controlled drone
• Single 4-inch (101mm) rolled slant-cut polished stainless steel tip
• New gaskets and hardware included; OEM-location hangers, direct bolt-on
• Stock-downpipe note: a stock-DP-to-aftermarket-cat-back adapter (e.g. GrimmSpeed) may be required with the factory downpipe
• Invidia part HS15SW4G3S