GReddy Supreme SP Cat Back Exhaust Honda Civic Type R 2017-2021 | 10158214

Upgrade the sound, style, and performance of your Honda Civic Type R with the Supreme SP Cat-Back Exhaust from GReddy. Designed with a focus on real-world drivability and dyno-proven gains, this premium street performance exhaust delivers a refined tone, improved airflow, and a measurable power increase for the turbocharged K20C1 engine.

Built from fully hand-welded 304 stainless steel, this system features large-diameter 3" mandrel-bent piping routed cleanly through the chassis to maximize exhaust flow while maintaining proper clearance. The specially shaped SP oval muffler controls tone and resonance, producing an aggressive yet controlled exhaust note measured at 88 dB(a) @ 3400 rpm during standardized testing.

Dual 2.5" outlets feed into polished, double-wall 4.5" tips, perfectly filling the factory rear diffuser opening and finished with the signature Supreme SP badge for a clean, motorsport-inspired appearance. Dyno testing shows gains of up to +16 horsepower, making this system an ideal balance of performance and daily drivability.

🔧 Features & Specifications

• Cat-back exhaust system with single oval muffler & dual tips

• 3-piece design for precise fitment

• 76 mm (3") mandrel-bent piping

• Dual 115 mm (4.5") polished tips

• Straight-through performance design

• No resonator for improved flow

• Includes 2 × replacement 3" oval gaskets

• Sound level: 88 dB(a) @ 3400 rpm

• Estimated gain: +16 HP

• Fully hand-welded 304 stainless steel construction

💡 Why Choose the Supreme SP Exhaust?

GReddy’s SP line is engineered to enhance performance without sacrificing refinement. The optimized piping diameter, precision muffler design, and high-flow architecture work together to improve turbo efficiency, throttle response, and overall driving excitement while maintaining street-friendly sound levels.