Invidia Gemini Cat-Back Exhaust for 17-21 Civic Si Coupe/Sedan

Invidia Gemini Cat-Back Exhaust for 17-21 Civic Si Coupe/Sedan

If you want a Civic Si exhaust system that actually feels like an upgrade and not just a louder muffler, the Invidia Gemini Cat-Back Exhaust is a solid pick. This Invidia cat-back fits the 17-21 Civic Si and gives you better flow than the factory setup, which usually means your car pulls cleaner from the midrange up top. You get a deep, sporty tone, but it stays more civilized than a lot of straight through systems. We run these exact parts on our own cars because they work without turning every drive into a drone fest. Both the Invidia Gemini Coupe Exhaust and Invidia Gemini Sedan Exhaust use SUS304 Stainless Exhaust construction with mandrel bent piping, plus CNC machined flanges for straightforward fitment. The Titanium triple tip look is the main visual flex here, looking right at home on a clean Si.

Variants

Civic Si Coupe (17-21)

• SKU: HS17CS27GM3ST
• Civic Si Coupe Catback with triple titanium tips
• Matches the Coupe body layout for proper tip position and clearance

Civic Si Sedan (17-21)

• SKU: HS17CS47GM3ST
• Civic Si Sedan Catback with triple titanium tips
• Built around the Sedan chassis dimensions, so you do not end up with crooked tips or weird bumper gaps