BMSPEC Spoiler Extension – Honda Civic Si Coupe 17+


Stabilize your rear end affordably with this stylish spoiler extension.

Our rear spoiler extension for the 10th generation Civic Si.

  • “Gurney Flap” style add-on: Our simple design works with your OEM spoiler to provide downforce and stability at speed.
  • Mounted with screws for durability: The extension solidly threads in to your spoiler at 4 points, with extra tape to protect your paint. No more peeling 3M tape after a few seasons!
  • CNC machined aluminum supports: Four 6061 aluminum supports keep the extension stiff and impart our signature aggressive aesthetic.

Made from specially-sourced polystyrene, and can be painted over or left in its raw finish. Includes all hardware needed to install.

Additional information

Weight4 lbs
Dimensions40 × 14 × 4 in



Civic Si


2017, 2018