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  • Invidia [15-21 WRX/STI] Gemini R400 Titanium Quad Tip Exhaust | HS15STIGM4ST
  • Invidia [15-21 WRX/STI] Gemini R400 Titanium Quad Tip Exhaust | HS15STIGM4ST
  • Invidia [15-21 WRX/STI] Gemini R400 Titanium Quad Tip Exhaust | HS15STIGM4ST
  • Invidia [15-21 WRX/STI] Gemini R400 Titanium Quad Tip Exhaust | HS15STIGM4ST
  • Invidia [15-21 WRX/STI] Gemini R400 Titanium Quad Tip Exhaust | HS15STIGM4ST

Invidia

Invidia 4.5 (2)

Invidia

Fits: 15-21 WRX

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Auto Parts Store of the Year 2026

Invidia Invidia
Fits: 15-21 WRX
4.5 (2)

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Fitment

Please Note: Fits 2015-2021 Subaru WRX and WRX STI Sedan (VA chassis). Invidia Gemini R400 cat-back, part HS15STIGM4ST: 3-inch (76mm) SUS304 stainless steel mandrel-bent piping, CNC-machined flanges, quad 101mm (4-inch) single-layer burnt titanium tips, deep aggressive tone that stays composed at cruise. OEM-location hangers with new gaskets and hardware included; a stock-DP-to-aftermarket-cat-back adapter (e.g. GrimmSpeed 077046) is required with a stock downpipe. Fitment and specs per authorized Invidia dealer listings (Import Image Racing HS15STIGM4ST; invidia-usa.com partially defunct at time of writing).
  • 2015–2021 Subaru | WRX STI
  • 2015–2021 Subaru | WRX

Description

The Invidia Gemini R400 Cat-Back Exhaust for the 2015-2021 Subaru WRX and WRX STI Sedan is the benchmark cat-back for the VA chassis, balancing strong flow with an aggressive tone. Built from 3-inch (76mm) SUS304 stainless steel with mandrel-bent piping and CNC-machined flanges, the system delivers a deep, pronounced exhaust note throughout the entire RPM band while staying composed at highway cruise. It exits through quad 101mm (4-inch) single-layer burnt titanium tips for Invidia's signature rear-end statement, and hangers welded onto the OEM locations make installation a direct bolt-on.

  • 2015-2021 Subaru WRX & WRX STI Sedan (VA chassis)
  • 3-inch (76mm) SUS304 stainless steel mandrel-bent piping, CNC-machined flanges
  • Quad 101mm (4-inch) single-layer burnt titanium tips
  • Deep, aggressive exhaust note; refined at cruise
  • OEM-location hangers; new gaskets and hardware included
  • A stock-DP-to-aftermarket-cat-back adapter (e.g. GrimmSpeed 077046) is required with a stock downpipe
  • Part number: HS15STIGM4ST

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