27WON Exhaust | 17-20 Civic Si

Unity Performance is the exclusive Canadian dealer for 27WON Performance products. US customers, please purchase directly through 27WON.

Fits:

• 2017 - 2020 Honda Civic Si (Coupe FC3, Sedan FC1)

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The 27WON Catback for the Civic Si is engineered to deliver a genuine performance exhaust note without the drone that makes most catbacks unbearable on long drives. A unique triple-resonator design — combining an absorption resonator and expansion chamber resonator in a single unit — removes unwanted low and high frequencies while letting exhaust gases pass straight through. The result: a growl under hard acceleration that settles into a composed, liveable tone at cruise.

Available in single large tip or dual round tip configurations. T304 stainless steel throughout, CNC mandrel bent, precision TIG welded. 11mm thick 3-bolt flanges with custom multi-layer steel gaskets for a leak-free, long-lasting seal — no band clamps, no 2-bolt flanges. All hardware is 100% stainless steel.

Features

• Triple-resonator design — absorption + expansion chamber resonators for refined tone
• Growls under throttle, composed at cruise — no drone
• T304 stainless steel throughout — CNC mandrel bent, precision TIG welded
• 11mm thick 3-bolt flanges — leak-free, long-lasting seal
• Custom multi-layer stainless steel gaskets
• 100% stainless steel hardware
• Available in single large tip or dual round tip
• Engineered and manufactured by 27WON Performance