GReddy Supreme SP Exhaust | 2017-2021 Honda Civic Si Coupe (10158216)



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Supreme SP Exhaust for 2017+ Civic Si Coupe by GReddy

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 smoothest 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


  • 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


  • 2017-2021 Honda Civic Si Coupe


  • Chassis: FC3 coupe
  • Engine: L15 Turbo
  • Number of pieces: 3
  • Piping: 76 mm (3 ")
  • Tips: 2x 115 mm (4.5 ")
  • Gasket(s): 3 " oval (qty: 2 included) replacement
  • Resonator: Yes

What's In The Box?

  • 1 - Supreme SP Exhaust System


  • GReddy Limited Lifetime Warranty

Customer Reviews

Based on 2 reviews
Daniel Clark
Maperformance does it again!

Great customer service as always. Exhaust came in about 4 days.
Greddy SP exhaust is well built. Sounds and looks great!
Great job by both companies.

Nice sound quality

Has a nice sound quality