Invidia N1 Cat-Back Exhaust System – 2012–2013 Honda Civic Si Coupe (FB6) | 70mm | Titanium Tip | K24Z7

Upgrade the exhaust note and flow of your 2012–2013 Honda Civic Si coupe with the Invidia N1 cat-back exhaust — a 70mm stainless steel cat-back system with Invidia’s signature N1 titanium tip engineered specifically for the 9th generation Civic Si coupe (FB6, K24Z7). The N1 delivers a more aggressive, higher-revving exhaust character that complements the K24Z7’s naturally aspirated VTEC powerband — a direct bolt-on replacement for the factory cat-back with no cutting, welding, or modifications required.

Key Features

• 70mm Stainless Steel Piping – Improved Flow for the K24Z7: 70mm mandrel-bent stainless steel piping — larger than the factory system, reducing back pressure and improving exhaust flow across the K24Z7’s RPM range. The larger 70mm diameter (vs the 60mm used on smaller platforms) is appropriate for the K24Z7’s displacement and flow requirements. Mandrel bending maintains consistent internal diameter through each bend for unrestricted flow
• Invidia N1 Titanium Tip – Rolled Edge: Invidia’s signature N1 titanium exhaust tip with rolled edge — a distinctive, high-quality finish that sets the N1 apart from generic stainless tips. Titanium tip develops a natural heat-blued patina over time for a premium, race-inspired appearance
• Aggressive VTEC Exhaust Note: The N1 enhances the K24Z7’s naturally aspirated VTEC character — delivering a more aggressive, higher-revving exhaust note that builds through the RPM range and opens up through the VTEC crossover point. A noticeably more characterful sound than the muted factory exhaust, suited for street and track use
• Cat-Back – Emissions Friendly: Cat-back system replaces the exhaust from the catalytic converter rearward — factory catalytic converter is retained, making this system emissions-friendly in most jurisdictions. Verify local regulations before purchasing
• Direct Bolt-On – 2012–2013 Honda Civic Si Coupe FB6: Engineered as a direct-fit replacement for the factory cat-back on the 2012–2013 Honda Civic Si coupe (FB6, K24Z7). Uses factory mounting points and includes all necessary gaskets and hardware. No cutting, welding, or modifications required. Verify your specific model year and body style (coupe) before ordering
• Invidia Quality: Manufactured by Invidia — a respected Japanese exhaust manufacturer known for high-quality stainless steel exhaust systems for JDM and performance applications worldwide

Specifications

• System Type: Cat-Back
• Pipe Diameter: 70mm
• Material: Stainless Steel, Mandrel-Bent
• Tip: Titanium (N1 Rolled Edge)
• Fitment: 2012–2013 Honda Civic Si Coupe FB6 (K24Z7)
• Part Number: HS12HC2GTT
• Barcode: HS12HC2GTT

Note: Fitment is for the 2012–2013 Honda Civic Si coupe (FB6) only — not for the sedan. Verify your body style before ordering. Titanium tip will develop a heat-blued patina over time — this is a natural characteristic of titanium, not a defect. Professional installation recommended. Apply anti-seize to all fasteners during installation. Check for exhaust leaks after the first heat cycle. Check local noise and emissions regulations before purchasing.