Turblown Cast FC3S Lower Intake Manifold – 13B Turbo

The Turblown Cast FC3S Lower Intake Manifold is a performance-focused upgrade for Mazda RX-7 FC3S 13B turbo engines, developed to improve airflow balance between rotors. Its large equal-length, equal-bend runners help balance volumetric efficiency, while the tapered runner design maintains air velocity and response.
 
Available for standard 4-port side-port or Semi Peripheral Port (Semi PP) engines, with additional injector provisions and a dedicated billet -8AN high-flow fuel rail included.
 
Choose Version
4-Port / Side-Port
4 injector positions
Billet -8AN fuel rail
 
Semi PP
6 injector positions
Billet -8AN fuel rail
 
Key Features
Cast aluminium construction
Equal-length / equal-bend runners
Tapered runner design
4-Port & Semi PP options
Additional injector positions
Billet -8AN fuel rail included
O-ringed flange for improved sealing
Material available for match-porting
Integrated heat-shield mounting provisions
Designed for high-power FC3S applications
 
Important: The injector locations are specific to the Turblown design, so other aftermarket fuel rails are not compatible.