GReddy 10158603 DD-R Cat-Back Exhaust for 2017-2021 Honda Civic Type-R FK8

Vehicle Fitment

• 2017-2021 Honda Civic Type-R (FK8; turbocharged L15 / K20 engine)

Features

• Full cat-back exhaust system - replaces stock rear exhaust from factory over-pipe to tips
• 304 stainless-steel construction for durability and corrosion resistance
• 3.0" (76 mm) main piping for improved exhaust flow and reduced back-pressure
• Dual high-flow straight-through muffler layout for aggressive sound and performance
• Dual 4.0" (101 mm) exhaust tips with removable/tunable tips for customizable sound and appearance
• Includes oval 3" gaskets for direct bolt-on installation - no cutting or welding required
• Resonated mid-section for manageable cabin drone while maintaining sporty exhaust note
• Designed specifically for FK8 chassis - ensures correct fitment, hangers align, and factory mounting points used

Specifications

• Part Number: 10158603
• System Type: Cat-back exhaust (rear muffler + mid-pipe + tips)
• Main Pipe Diameter: 76 mm (3.0")
• Outlet Tip Size: 2 x 101 mm (4.0") dual tips
• Construction Material: 304 stainless steel
• Muffler Design: Dual high-flow straight-through mufflers with removable/tunable tips
• Included Gaskets: 2 x 3" oval replacement gaskets for install
• Fitment: 2017-2021 Honda Civic Type-R FK8; compatible with standard over-pipe and stock catalytic converter
• Installation: Direct bolt-on; uses factory exhaust hangers and mounting points

Included Components

• 1x Rear muffler section with dual muffler chambers & dual exhaust tips
• 1x Mid-pipe (3.0" inlet) to connect stock over-pipe to muffler section
• 2x 3" oval exhaust gaskets for flanges

Product Description

The GReddy 10158603 DD-R Cat-Back Exhaust is a premium, performance-oriented exhaust upgrade engineered especially for the 2017-2021 Honda Civic Type-R (FK8). Built from 304 stainless steel with 3.0" main piping and dual high-flow muffler chambers, this system significantly improves exhaust flow compared to stock, reduces back-pressure, and delivers a more aggressive exhaust note. The dual 4" tips provide a distinctive, sporty appearance, and the removable tip design allows owners to fine-tune the exhaust sound and flow to their preference - a feature that sets DD-R apart from many standard cat-backs.

Installation is straightforward and bolt-on: the system uses factory mounting points and includes gaskets, so no cutting or fabrication is required. Because it's designed specifically for the FK8 chassis, you can expect proper hanger alignment, correct tip exit position, and reliable fitment. The mid-pipe resonator helps manage cabin drone while preserving a performance-oriented exhaust tone - making this system suitable for daily driving as well as spirited or track-day use. For Civic Type-R owners looking for a balance of looks, sound, and flow gains, the GReddy 10158603 offers a high-quality OEM-plus upgrade.