GReddy 17-21 Honda Civic SI Sedan Supreme SP Exhaust (10158217)
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Our dual muffler Supreme SP cat-back exhaust is tailored to the 10th generation (FC1) Sedan model of the Honda Civic Si. The extended sedan version has similar features to our coupe counterpart, including high flow with a tuned exhaust note. The system produces the distinctive GReddy deep exhaust grumble while driving aggressively at wide-open throttle. This three-piece, cat-back exhaust expands to a large 3" (76mm) forward-mid pipe and mid pipe that split to two polished, straight-through SP oval mufflers and dual center-exit dual-wall GReddy tips to improve the performance of the turbocharged 1.5L engine. Our system bolts to the factory exhaust system at the flange behind the engine/transmission. The sedan version has a slightly more aggressive tip angle and the muffler combination is a better compliment to the Si sedan’s sporty, but wide rear bumper tip opening. Like all GReddy Supreme SP systems, the fully hand-welded 304 Stainless-Steel exhausts carry a Limited Lifetime Warranty.
- Honda Civic SI Sedan (2017, 2018, 2019, 2020, 2021)
- 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
- Chassis: FC1 4door Sedan
- Engine: L15 Turbo
- Type: 3" Cat-back with dual oval muffler with dual tips
- Number of pieces: 3
- Piping: 76 mm (3 ")
- Tips: 2x 115 mm (4.5 ")
- Gasket(s): 3 " oval (qty: 2 included) replacement
- Resonator: Yes
- Weight: TBA lbs (Stock weight TBA lbs)
- Sound Comparison (SAE J1169) Test: TBA dB(a)
- HP: +TBA hp
- TRQ: +TBA ft-lbs
In stock, non special order items can be returned within 30 days of the product arriving to your house or place of work.
Returns will NOT be accepted on final sales, special orders, opened, installed, incomplete, or otherwise used products. In order to initiate a return, an RMA number must be requested and approved via e-mail.
All returns will be subject to a 20% restocking fee minus complete shipping cost (roundtrip).
Any processed orders that have not shipped will incur a 6% cancelation refund fee unless the product was not available to ship within a timely manner. No fee will be incurred if used as store credit.
For complete details on our return policy, please see our Help and FAQ link under HELPFUL INFO.