Built for the 7 Second Pass
The CSF8401 No Limit Billet Air-To-Air Competition Manifold replaces the restrictive factory charge cooler on the B58 and S58 platform with a CNC-machined 6061 billet aluminum design built for extreme horsepower. Engineered alongside Custom Plenum Creations and proven on record-setting 7-second quarter mile cars, the CSF8401 removes the integrated charge cooler entirely so builders can run much larger front-mount air-to-air or air-to-water intercooler setups without airflow restriction.
Key Features
- CNC-machined from solid 6061 billet aluminum for extreme strength and durability
- Supports high performance builds exceeding 1500 horsepower
- Internal velocity stacks for optimized airflow and improved cylinder distribution
- CFD optimized plenum and runner design for balanced cylinder to cylinder airflow
- O-ring sealed design for leak free performance under extreme boost
- Large throttle body flange sized for the S55 77mm throttle body versus the 67 to 68mm OEM unit
- Integrated sensor pads for additional data monitoring or vacuum sources
- Includes billet fuel rail for high performance port fueling
- Modular runner ports for secondary port injection, nitrous, or methanol injection
- Thermal rejection competition spacer reduces intake air temperature and heat soak
- Track proven on multiple record setting quarter mile vehicles
Specifications
| Detail | Value |
|---|---|
| MPN | CSF8401 |
| UPC | Not published by manufacturer |
| Material | 6061 billet aluminum |
| Finish | Raw billet |
| Charge cooler configuration | Air-to-Air or Air-to-Water compatible |
| Throttle body flange | S55 style, 77mm |
| Fuel rail | Included, billet construction |
| Horsepower rating | 1500+ WHP |
| Engine platforms | BMW B58, BMW S58, B58 engine swap applications |
| Warranty | Manufacturer limited warranty against defects |
What’s Included
- CSF8401 billet competition manifold
- Billet fuel rail
- Thermal rejection competition spacer
- Hardware and installation kit
- NPT port plugs for unused sensor and injection ports
About CSF
CSF is a motorsports focused cooling and manifold manufacturer known for OEM quality bar and plate intercooler cores and billet charge cooler manifolds. CSF products are engineered using computational fluid dynamics and validated on track with race teams competing at the highest levels of drag and time attack competition.
Related Parts on Our Site
- Shop Intercoolers and Charge Pipes
- Shop All CSF Products
Frequently Asked Questions
What is the CSF8401?
The CSF8401 is a billet aluminum competition intake manifold that replaces the factory B58 or S58 charge cooler housing, removing the integrated charge cooler entirely to allow builders to run much larger front-mount intercoolers for horsepower goals exceeding 1500 WHP.
Which engines does the CSF8401 fit?
The CSF8401 is designed for the BMW B58 and S58 inline-six platforms, including the M240i, M340i, M440i, GR Supra, and B58 engine swap applications.
Does the CSF8401 include a fuel rail?
Yes, a billet fuel rail for a 6-injector top-feed setup is included. An optional second fuel rail for a 12-injector configuration is available separately from CSF.
Can the CSF8401 support an air-to-water intercooler?
Yes, the manifold is compatible with both air-to-air and air-to-water external intercooler configurations.
What throttle body does the CSF8401 use?
It uses a throttle body flange sized for the S55 77mm unit, which is significantly larger than the factory B58 67 to 68mm throttle body for improved airflow at high boost.
Is professional installation required for the CSF8401?
Yes. Installation involves significant engine disassembly and requires a technician experienced with B58 and S58 engine platforms, custom intercooler piping, and fuel system modifications.
Does the CSF8401 support nitrous or methanol injection?
Yes. Modular ports on each cylinder runner accept secondary port injection, nitrous, or methanol injection fittings.
What vehicles does the CSF8401 fitment cover?
The CSF8401 covers the BMW M240i, M340i, M440i, Toyota GR Supra (B58-equipped), and any vehicle built around a B58 or S58 engine swap platform.
Installation Overview
- Remove the factory intake manifold and charge cooler assembly per platform service procedures
- Transfer or install injectors and sensors to the CSF8401 manifold
- Mount the billet fuel rail and connect fuel lines per the included hardware diagram
- Install the thermal rejection competition spacer between the manifold and cylinder head
- Secure the manifold using the supplied hardware kit per specified torque values
- Connect sensor pads, vacuum sources, and any port injection or nitrous lines as needed
- Install the front-mount air-to-air or air-to-water intercooler and connect charge piping
- Plug all unused NPT ports, verify all connections, and bleed the cooling system if using air-to-water
California Residents: This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. For more information, visit www.p65warnings.ca.gov.
