Replace the factory catback on your 10th Gen Honda Civic Si with the Invidia Gemini R400, a 70mm stainless-steel exhaust system with three burnt titanium tips. Choose the Sedan or Coupe version to match your car.
Fitment Information
- Honda Civic Si Sedan FC1 1.5L Turbo (2017, 2018, 2019, 2020, 2021)
- Honda Civic Si Coupe FC3 1.5L Turbo (2017, 2018, 2019, 2020)
Important Fitment Note
Select the Sedan or Coupe variant that matches the vehicle. The applications use different exhaust part numbers and are not interchangeable. This listing is for the Civic Si; it does not fit the Civic Type R or regular Civic hatchback.
Product Description
The Invidia Gemini R400 is a catback exhaust for the 10th-generation Civic Si. It replaces the exhaust piping and mufflers behind the factory emissions equipment. The system uses polished SUS304 stainless-steel piping with a nominal 3-inch size (70mm), a three-piece layout, one mid-pipe resonator and three mufflers. The resonator and mufflers are part of the exhaust design; this is not a straight-pipe system.
The system exits through three burnt titanium-finish tips, each listed at 101mm (4 inches) in diameter. Invidia’s Sedan and Coupe applications have separate part numbers, and the exhaust hangers are positioned for the vehicle’s factory mounting locations. Installation requires working beneath the car and aligning the exhaust sections and hangers; a lift or professional exhaust installation is recommended.
Key Features
- Invidia Gemini R400 catback exhaust
- 70mm (nominal 3-inch) polished SUS304 stainless-steel piping
- Three-piece exhaust layout
- One mid-pipe resonator and three mufflers
- Three burnt titanium-finish exhaust tips, 101mm (4 inches) each
- Designed around the factory exhaust hanger locations
- Separate Sedan and Coupe applications
Specs
- Manufacturer: Invidia
- Series: Gemini R400
- Product type: Catback exhaust
- Piping diameter: 70mm
- Material: SUS304 stainless steel
- Exhaust layout: Three-piece, with one resonator and three mufflers
- Tip style: Triple burnt titanium finish
- Tip diameter: 101mm (4 inches)
- Sedan part number: HS17CS47GM3ST
- Coupe part number: HS17CS27GM3ST
Pairs Well With
- PRL Cobra Cold Air Intake for Honda Civic Si 1.5T – PRL’s intake system is available for the 10th-gen Civic Si and complements an exhaust upgrade as part of a broader airflow setup.
- PRL Intercooler Upgrade for Honda Civic 1.5T and Si – A compatible charge-air cooling upgrade for the turbocharged 1.5T application.
- PRL Intercooler Charge Pipes for Honda Civic 1.5T – PRL charge pipes for the same 2016–2021 1.5T Civic platform.
About Invidia
Invidia develops aftermarket performance exhaust systems and related components for a range of vehicle applications. The Gemini line includes vehicle-specific catback systems with different layouts and tip configurations.
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