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
Pure induction sounds.

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

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

InfinityDesign's unique product design and engineering is crafted by the grand-daddy of the most popular S85 products and tuners to hundreds of S85s: Salmen.
As a former Evolve co-owner, he headed engineering & development for all products.
He notably signed off on numerous popular V10 products: e-tronic exhaust systems, headers, cat deletes, carbon intakes along with the V8 supercharger kits & tuning maps during the 2000s until he exited the company in 2015.