Magnaflow Competition Series Catback | 2017-2021 Honda Civic Si Sedan (19394)

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$1,112.00 $1,757.11Instant Savings of 37% ($645.11)

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17-21 Civic Si Competition Series Catback Exhaust by Magnaflow

The MagnaFlow Competition Series Exhaust Systems are designed for those seeking maximum performance, reduced mass and an aggressive exhaust note that demands attention. These systems may not comply with all local or federal noise requirements.


  • All Mandrel Bent Tubing
  • 409 Stainless Steel Construction with High Temp Satin Black Coating
  • Increased Horsepower and Torque
  • Lifetime Construction Warranty
  • Made in USA


  • 2017 - 2021 Honda Civic Si Sedan

What's In The Box?

  • 1 - Inlet Pipe Assembly
  • 1 - Resonator Assembly
  • 1 - Mid Extension Pipe
  • 1 - Muffler Assembly
  • 3 - 2.50" V Clamps



  • Magnaflow Limited Lifetime Warranty

Customer Reviews

Based on 1 review
Thomas V
Perfect for me. But may not be for others.

Quality: great.
Sound: 1 being stock and 10 being straight pipe. This is a 3/10. (Which is perfect for me). It’s just slightly louder but has a deeper growl. Keep in mind I do not have an upgraded down pipe.
No crackle pops but some gurgles are present now.
Install: easy pezzy. Done with jack stands. Used dish soap for hangers and came off with ease. Pieces aligned perfectly.
Power gains: not very noticeable. I think it sheds about 15
10lbs from stock.
Drone: I have not noticed it yet and non of my passengers have mentioned anything on the city or highway.
The finish on the tips look very shiny at first but once installed it looks like the stock finish.
If noise was 5/10 from the scale I mentioned above I would give it 5stars. But then it would no longer be perfect for me.
Besides catback exhaust I only have prl cobra cai. (5/5 stars)