Invidia HS12HC2G3S Q300 Catback Exhaust SS Tip for 2012-15 Honda Civic Si Coupe

Vehicle Fitment

• 2012-2015 Honda Civic Si (K24L4 2.4L, Coupe) - Fitment confirmed for 9th-gen Civic Si coupes only; sedan variant uses different part #. Fitment confirmed through 2015. 2016+ unconfirmed at time of listing.

Features

• Invidia Q300 cat-back exhaust system engineered for freer flow and performance gains
• Mandrel-bent SUS304 polished stainless steel piping for improved exhaust flow
• Flat-bottom muffler design for high-speed aerodynamic clearance
• Polished rolled stainless-steel single exhaust tip for clean rear appearance
• Resonated design for a deep, rich sporty exhaust tone
• Robot-TIG welded and CNC-machined flanges for strong, leak-resistant joints
• Direct bolt-on installation using OEM hangers and included hardware
• Improves throttle response and horsepower/torque over stock exhaust

Specifications

• Part Number: HS12HC2G3S
• Series: Invidia Q300 catback
• Primary Material: SUS304 polished stainless steel
• Piping Diameter: ~70 mm (2.75")
• Exhaust Tip: ~110 mm polished rolled stainless tip (single exit)
• Fitment: 2012-2015 Honda Civic Si Coupe (K24 2.4L naturally aspirated)
• Installation: Direct bolt-on with included gaskets & hardware
• Sound: Deeper sporty tone with minimal highway drone

Included Components

• 1x Invidia Q300 cat-back exhaust assembly (HS12HC2G3S)
• 1x Polished rolled stainless exhaust tip
• 1x Set of installation gaskets
• 1x Bolt and hardware kit

Product Description

The Invidia HS12HC2G3S Q300 Cat-Back Exhaust with Polished Stainless Tip is a performance exhaust upgrade designed specifically for 2012-2015 Honda Civic Si Coupes. Built from high-quality SUS304 polished stainless steel with mandrel-bent piping, the Q300 system improves exhaust gas flow and reduces back pressure compared to the stock exhaust. The flat-bottom muffler design offers increased aerodynamic clearance at speed while the resonated configuration delivers a rich, sporty exhaust tone that enhances everyday driving without excessive drone.

Featuring a polished rolled stainless steel tip, this cat-back exhaust enhances rear aesthetics while maintaining durable corrosion resistance. Direct bolt-on installation uses OEM hanger locations and includes gaskets and hardware for straightforward fitment. Tailored to the 9th-generation Honda Civic Si coupe with the K24 2.4L engine, the HS12HC2G3S delivers improved throttle response, stronger mid-range power, and a more engaging driving experience. Fitment confirmed through the 2015 model year; compatibility beyond that is unconfirmed at the time of listing.