Invidia HS06HC4G3S Q300 Cat-Back Exhaust for 2006-2011 Honda Civic Si Sedan

Vehicle Fitment

• 2006-2011 Honda Civic Si (FA5 Sedan, 2.0L I4)
• 2008 Honda Civic MUGEN Si (FA5 Sedan)

Features

• Mandrel-bent SUS304 stainless steel piping for optimal flow
• Q300 muffler design for balanced performance and tone
• Single rolled polished stainless steel exhaust tip (110 mm)
• Optimizes exhaust gas flow for improved throttle response
• Reduces back pressure to support horsepower and torque gains
• Deep, rich yet refined sport exhaust note
• Direct bolt-on installation with OEM hanger compatibility
• Precision CNC-machined flanges and robot TIG-welded joints

Specifications

• Part Number: HS06HC4G3S
• Type: Q300 Series Cat-Back Exhaust
• Material: SUS304 Stainless Steel
• Piping Diameter: ~70 mm (≈ 2.75 in)
• Tip Diameter: ~110 mm (≈ 4.33 in)
• Exit Configuration: Single rear exit
• Fitment: Sedan Honda Civic Si with 2.0L I4

Included Components

• 1x Q300 Cat-Back Exhaust Assembly
• 1x Rolled polished stainless steel exhaust tip
• 1x Hardware kit (bolts, clamps, gaskets)
• 1x Installation instructions

Product Description

The Invidia HS06HC4G3S Q300 Cat-Back Exhaust is a performance-engineered exhaust system designed specifically for the 2006-2011 Honda Civic Si Sedan and compatible with the 2008 Honda Civic MUGEN Si variant. Constructed from high-quality SUS304 stainless steel with mandrel-bent piping and a tuned Q300 muffler, this exhaust enhances airflow compared with the stock system, helping to improve throttle response, horsepower, and torque. The single rolled polished stainless steel tip gives your Honda a sleek, sporty appearance at the rear.

Installation is straightforward with a direct bolt-on design that uses OEM hangers and included hardware - no cutting or welding is required. The Q300 muffler design strikes a balance between rich, performance-oriented sound and daily-friendly tone, providing a deeper exhaust note without excessive drone. Precision-machined flanges and durable construction ensure long-lasting performance that holds up under spirited driving. Whether you're improving performance or enhancing exhaust sound and style, this Invidia cat-back is a popular upgrade among Civic Si enthusiasts.