S85 CSL OE+ Carbon Plenum

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More induction sound.

The thinner pre-preg carbon constructions allows for more induction noises to come through.

Leak free.

The lid, sid inlets and trumpets come installed with neoprene gaskets. This material tolerant to extreme conditions and temperatures of up to 500F / 260C.  

OE hardware compatibility.

The design incorporates all OE hose fittings along with oil separators.

Pick your finish.

The Gloss and Matte finishes are achieved using a 2 component automotive clear-coat.
Spec your plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum
S85 CSL OE+ Carbon Plenum

S85 CSL OE+ Carbon Plenum

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Specifications: 

  • Modular Plenum Design: 
    • Modular velocity stacks design for customization per performance objectives. 
    • Modular intake inlet design for increase air volume. 
    • Modular construction for easy fitting to the angled S85 throttle bodies. 
    • Removable bolted lid for easy access to velocity stacks & removal of the plenum.
  • CNC'ed ITB fittings for reliability. 
  • Retains all PCV and vacuum hoses.
  • Complete pre-preg & autoclaved carbon fiber construction 
    • 2x2 weave pattern
    • Matte or Gloss clear coated finish.

OEM CSL style kit includes: 

  • Plenum design with OEM diameter inlets.
  • Fitted with OEM style velocity stacks. 
  • Fits with OEM style air intakes
  • Compatible with MAF, AlphaN highly recommended


      Mandatory Engine Mapping

      The carbon plenum runs using Alpha N as the engine mapping protocol. No rewiring nor new sensors is needed on the OE+ variant.

      Read my Alpha N notes
      It's counterintuitive, but it fits.

      In this journal entry, I cover the hardware requirements and the plenum's counter-intuitive installation process.

      Read the installation notes

      Pure induction sounds.

      The sound is taken from a Sennheiser MK400 microphone on top of the A7ii. No under the hood trickery.
      Build journal: a special series
      From a myth, to a prototype, to reality.

      In 2009, BMW M built a one-off prototype of a BMW M5 CSL based on the E60 M5 V1 to celebrate its 25th year.

      Amongst many must-have components, the engineers at BMW M developed a complete carbon intake prototype in short order.

      It was never released.  

      In this Special Series, I take a dive into the backstory, development, installation and impressions of the InfinityDesign S85 CSL Carbon Plenum.

      Enjoy,
      - Matt / @m3_epoustouflant

      Upgrade to the Competition Spec
      The side inlets and sealed intake inlet tubes can be upgraded to complete the intake kit to original CSL specifications.
      Need help?
      Been there done that.