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  • Greddy Supreme SP Cat Back Exhaust Honda Civic SI Sedan 2017-2018 | 10158217
  • Greddy Supreme SP Cat Back Exhaust Honda Civic SI Sedan 2017-2018 | 10158217
  • Greddy Supreme SP Cat Back Exhaust Honda Civic SI Sedan 2017-2018 | 10158217

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Supreme SP Cat-Back Exhaust

Fits: 17-20 Civic Si Sedan

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Auto Parts Store of the Year 2026

GReddy Supreme SP Cat-Back Exhaust
Fits: 17-20 Civic Si Sedan
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Fitment

Please Note: Official GReddy series page: "Honda Civic Si (Sedan) 2017-on (10158217)" - "2017-on Honda Civic Si 4door Sedan (only)" (FC1, L15 Turbo). Sedan = 10158217 confirmed. Legacy "2017-2018" understates - the 10th-gen Si ran 2017-2020; 2017-20 applied. Same specs as the coupe (10158216) in a longer sedan layout. Buckets use 2017-2021 Honda | Civic Si (no 2017-20 bucket exists). Legacy vendor spelling "Greddy" corrected to "GReddy".
  • 2017-2021 Honda | Civic Si

Description

The GReddy Supreme SP Cat-Back Exhaust for the 2017-2020 Honda Civic Si Sedan (FC1) is a 3-piece system with 76mm (3-inch) piping and a resonator feeding dual oval SP mufflers with dual center-exit 115mm (4.5-inch) dual-wall tips, in a longer sedan-specific layout with a slightly more aggressive tip angle. Hand TIG-welded 304 stainless steel with a Limited Lifetime Warranty.

  • Fits 2017-2020 Honda Civic Si Sedan (FC1) - sedan only
  • 3-piece cat-back; 76mm (3-inch) piping with resonator
  • Dual oval SP mufflers; dual center-exit 115mm (4.5-inch) dual-wall tips
  • Longer sedan-specific layout; slightly more aggressive tip angle
  • Hand TIG-welded 304 stainless steel; Limited Lifetime Warranty
  • GReddy part 10158217

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