AFE: Twisted Steel Down-Pipe (Race Series) Honda Civic / Civic Si 16-20 I4-1.5L (t) corvette headers They are OD-ground for consistency

They are OD-ground for consistency and black oxide-finished with their length and part number laser etched on the OD for ease of identification

aircraft aluminum billet

I-beamed spokes

and a vent tube to direct the purged nitrous out of the solenoid

Here are some specs of the porting option:

AFE: Twisted Steel Down-Pipe (Race Series) Honda Civic / Civic Si 16-20 I4-1.5L (t) corvette headers They are OD-ground for consistencyRace Version: This down pipe was designed as a "Race" version for added performance and a more aggressive sound. Factory Mounting Locations: The down pipe mount directly to factory mounting locations and includes hardware for a hassle free installation. Tapered Design: A unique 3" tapered design is used to increase exhaust velocity and increase usable torque. This means more aggressive throttle response and increased passing power. Factory Style