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After extensive engineering analysis and real-world testing, one conclusion became very clear:
Stainless steel is the correct material for S65 VANOS covers.
The VANOS ring itself is hardened steel. When a softer material like aluminum is used in a high-vibration, high-cycle environment, micro-wear can develop over time at the contact points. It’s not immediate, but over thousands of cycles, that wear can reduce retention.
Stainless steel eliminates that issue entirely by matching the hardness and durability of the mating surface. There’s no compromise here. SS is just the right material for the application.
Beyond material choice, these covers were redesigned with:
• Internal balancing to minimize vibration at higher RPM
• Clear, precise alignment features to ensure proper seating
And just as important as material is fitment and tolerances. No other company has this level of data and research behind their VANOS covers. Every unit is verified through a metrology lab with 40+ dimensional checks to ensure perfect fitment and consistency. That level of validation matters.
These have been tested through heat cycles, track abuse, and sustained high-RPM driving and the result speaks for itself: Once they’re on, they stay on.
And in 2026, I can confidently say this is the best option available. Bar none.
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