Invidia N1 Catback Exhaust for 06-11 Civic Si

Invidia N1 Cat-Back Exhaust - 2006-2011 Honda Civic Si

Want more power and better sound from your 8th gen Civic Si? The Invidia N1 cat-back exhaust replaces your factory exhaust from the catalytic converter back with mandrel-bent SUS304 stainless steel piping. Your factory exhaust's restrictive and it chokes your K20Z3 at high RPM. The Invidia N1 flows way better, which gives you more power in the mid-range and top-end. You're also getting a louder, more aggressive exhaust note. Invidia makes this exhaust in two different pipe sizes (2.75" and 3") for both coupe and sedan, so pick the one that matches how you're using your car.

2.75" vs 3" Piping

Invidia makes the N1 in 2.75" and 3" piping. The 2.75" version's quieter and it makes better low-end and mid-range power. If you're daily driving your Civic Si and you want more power without drone on the highway, get the 2.75". The 3" version's louder and it flows more at the top end. If you're making big power with a turbo or you just want the loudest exhaust possible, get the 3". For a stock or mildly built K20Z3, the 2.75" makes more usable power because it keeps exhaust velocity up.

Mandrel-Bent SUS304 Stainless Steel

The exhaust's made from SUS304 stainless steel with mandrel bends. Mandrel bends keep the pipe diameter consistent through the bends, which means better flow compared to crush-bent exhausts. SUS304 stainless resists rust way better than mild steel, so your exhaust's not going to rust out in a few years if you're driving in winter salt or humid climates. The flanges are CNC-machined for a tight fit at the connections.

What You Get

• Invidia N1 cat-back exhaust system
• Mandrel-bent SUS304 stainless steel construction
• CNC-machined flanges
• Burnt tip finish
• All mounting hardware and gaskets included

Available Versions

• Coupe 2.75" (HS06HC2GTT): Quieter, better low/mid power
• Coupe 3" (HS06HC2STT): Louder, more top-end flow
• Sedan 2.75" (HS06HC4GTT): Quieter, better low/mid power
• Sedan 3" (HS06HC4STT): Louder, more top-end flow

Fits Your Car

• 2006-2011 Honda Civic Si Coupe
• 2006-2011 Honda Civic Si Sedan
• 2008 Honda Civic MUGEN Si

Compatible Engines

• K20Z3 (2006-2011 Civic Si)

Note: Order the correct version for your car. Coupe exhausts don't fit sedans and sedan exhausts don't fit coupes. The 2.75" version's quieter and makes better low/mid power. The 3" version's louder and flows more at the top end. For a stock or mildly built K20Z3, the 2.75" makes more usable power. Get your car retuned after you install this exhaust if you're running other mods.