Greddy 2017-2021 10th Gen Honda Civic SI Coupe DD-R Resonated Exhaust

The GReddy DD-R Exhaust System for the 2017-2021 Honda Civic Si Coupe is a performance exhaust designed for enthusiasts who want a more aggressive sound and a simpler, more functional design. This system is a standout because it lacks a traditional muffler, which contributes to its unique sound and streamlined appearance.

One of the key features of this exhaust system is its aggressive sound note. The absence of a muffler allows the exhaust to produce a deep, throaty sound that is more pronounced than the stock exhaust. This sound is particularly noticeable when the turbocharger spools up, creating a distinct and sporty tone that enhances the overall driving experience. For those who enjoy hearing their car's engine, this exhaust system offers a satisfying and powerful sound that complements the Civic Si's turbocharged engine.

The DD-R Exhaust System is resonated, which helps to control and refine the sound without completely dampening it. The resonator reduces some of the harsher tones, making the exhaust note aggressive but not overly loud or droning. This balance makes it suitable for both daily driving and spirited performance driving, allowing you to enjoy the best of both worlds.

In terms of design, the DD-R Exhaust System is straightforward and simplified. It features dual straight-through pipes that exit at the rear of the vehicle. The lack of a muffler and the simple piping layout give the exhaust a clean and minimalist look. This design not only enhances the visual appeal of the rear of the Civic Si but also reduces weight compared to more complex exhaust systems. The reduced weight can contribute to a slight improvement in performance, as the car has less mass to carry.

The exhaust system is made from high-quality materials, ensuring durability and longevity. The pipes are constructed from stainless steel, which is resistant to rust and corrosion. This makes the exhaust system a reliable choice for those who drive in various weather conditions. The tips of the exhaust are polished for a sleek finish, adding a touch of style to the vehicle's rear.

Installation of the DD-R Exhaust System is relatively simple and can be done with basic tools. It is designed to be a direct bolt-on replacement for the stock exhaust, meaning it uses the factory mounting points and does not require any cutting or welding. This makes it an attractive option for those who want to upgrade their exhaust system without needing extensive modifications.

In summary, the GReddy DD-R Exhaust System for the 2017-2021 Honda Civic Si Coupe is a performance-oriented exhaust that offers an aggressive sound, a simplified design, and high-quality construction. Its lack of a muffler allows for a more pronounced exhaust note that complements the turbocharger, while the resonator ensures the sound remains refined. The straightforward design and easy installation make it a practical choice for enthusiasts looking to enhance both the performance and appearance of their Civic Si.

Fitment: 2017 2018 2019 2020 2021 Honda Civic Si Coupe only
Chassis:  FC3 coupe

Engine:  L15  Turbo
Type:   3" Cat-back with dual compact muffer tips

Number of pieces: 3
Piping:   (slight taper at 1st flange allow it to connect to the factory overpipe)
              1x 76 mm (3") 11000328 - 2x 76mm (3.0") 11000327
Tips:   2x 101mm (4 ") with GPP logo
Gasket(s):    3" oval (qty: 2 included) replacement
Resonator:   yes

Part #: 10158600