Air Intake & Exhaust Upgrade Kit | 2017-2021 Honda Civic Si Coupe

Bolt-On Air Intake and Exhaust System Upgrade Kit for 2017-2018 Honda Civic Si

AEM Cold Air Intake Kit (21-830C)

This Performance Air Intake System allows your engine to breath more air compared to the restrictive factory air intake housing. It is designed, tuned, and dyno-tested to produce more horsepower and torque. The cone-shaped AEM Dryflow air filter is made from an oil-free, synthetic filter media that can be used for up to 100,000 miles before cleaning is needed (depending on driving conditions). A custom shaped heat shield with edge trim lining is included to keep engine bay heat from the air intake. The air intake tube is constructed from mandrel-bent aluminum featuring a durable gunmetal gray powder coated finish. This air intake system is backed by AEM's Lifetime Limited Warranty. Some AEM air intakes are not legal for sale or use in California.

Features

• Increased horsepower
• Heat shield with edge trim lining
• Low restriction aluminum tubing
• Air filter lasts up to 100,000 miles before cleaning is required (depending on driving conditions)
• Washable and reusable oil-free filter media
• AEM Lifetime Limited Warranty

GReddy Supreme SP Catback Exhaust System (10158216)

The Supreme SP cat-back exhaust, for the turbocharged 10th generation Honda Civic Si Coupe, improves the performance, sound quality and styling, by applying our signature SP (Street Performance) ideals into the design.

The system not only incorporates large 76mm (3”) piping, but smoothes out and simplifies the heavier, factory muffler layout with the free flowing, compact oval SP mufflers. This allows the engine to be more efficient for added performance, without having drone or being loud. The Supreme SP sound level was carefully tuned not to require any additional resonators; this also helps lighten up the system.

The polished stainless-steel center-exit exhaust is finished off with stylish dual, double-wall, slant cut GReddy tips, to enhance the Civic Si's sporty rear diffuser. Like all GReddy Supreme SP systems, the fully hand-welded 304 Stainless-Steel exhausts carry a Limited Lifetime Warranty

Features

• Fully Hand-Welded 304 Stainless Steel
• Large 76mm (3") Diameter Piping
• Free Flowing, Compact Dual SP Mufflers
• Improved Performance and Sound w/o Drone
• Carefully Tuned Not To Require Additional Resonators
• Finished Off w/ Stylish Dual, Double-Wall, Slant-Cut Tips

Applications

• 2017-2021 Honda Civic Si Coupe

What's In The Box?

• (1) AEM Cold Air Intake System
• (1) GReddy Supreme SP Catback Exhaust System

Warranty

• Individual Manufacturer's Limited Lifetime Warranty

References

• AEM 21-830C Installation Guide
• AEM 21-830C Dyno Results
• GReddy 10158216 Sound Clip (MP4)