The Borla 17217 is a header for Subaru WRX and STi applications, with 1.625-inch primary tubes that feed a 2.25-inch collector, the tube sizes the manufacturer publishes for this part. Those diameters are the first numbers to compare when weighing it against a stock manifold or a cheaper aftermarket header, because primary tube size shapes how exhaust gas moves away from the engine. Buyers who need California Air Resources Board paperwork also get a documented link to compliance, since the manufacturer states the header is covered by CARB Executive Order D-276-12.
Fitment is where to slow down before ordering. The manufacturer's CARB documentation ties this header to 2001-2003 Subaru Impreza WRX models, and fitment details published elsewhere vary, so confirm your exact model year and drivetrain with Borla first. Gaskets are not included, so plan to reuse your factory gaskets or buy replacements separately. Enthusiasts searching for a Borla 17217 WRX STi header, a CARB EO D-276-12 Subaru header, or a 1.625 primary WRX header install will want those details confirmed before the wrench comes out.
No. The manufacturer states gaskets are not included, so you should reuse the original equipment gaskets or purchase new ones separately.
The manufacturer states the header is covered by California Air Resources Board Executive Order D-276-12, and it lists that order for 2001-2003 Subaru Impreza WRX models.
Fitment details vary across sources. The manufacturer's documentation references 2001-2003 WRX models, so confirm your exact year and model with Borla before buying.
Because gaskets are not supplied, settle your gasket plan before starting the job: either reuse the factory gaskets in good condition or source new ones. Confirm your model year with the manufacturer first, since the documented fitment is narrower than some listings suggest. Install difficulty, required tools, and torque specifications were not confirmed in this research, so follow the manufacturer's installation instructions and a service manual for your specific vehicle.
