Engineering
What goes into a part before it ships.
Material selection, tolerances, and how fitment is verified across five chassis.
How Fitment Is Verified
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OEM Cross-Reference
Factory part numbers are cross-referenced across all five chassis to establish which interfaces are genuinely shared, before any design work begins.
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CAD Modeling
Mounting points are modeled from factory geometry and the assembly is motion-simulated through its full travel to check for interference, binding and clearance.
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Physical Test Fit
Parts are test-fitted on an E46 in our own shop, and the fitment table on the About page states which chassis have been physically fitted and which are confirmed by cross-reference.
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Road and Track
Every component is driven before release — on road for daily behaviour, on track for load, heat and repeated abuse.
Choosing the Material
Four processes are in regular use here. Each is chosen for what the part actually has to do.
- Forged Carbon
- Compression-molded chopped fiber. High stiffness-to-weight with useful vibration damping, and no repeating weave — the marbling is unique to every part.
- Billet Metal
- CNC-machined 6061-T6 aluminum and stainless steel. Used wherever a part carries load, holds alignment or takes fastener preload.
- Urethane & Polymer
- Cast 80A polyurethane for controlled compliance. Carbon-reinforced PETG printed to OEM dimensions for non-structural trim.
Where Carbon Doesn’t Belong
Composite is not the answer to everything. Structural interfaces that carry load, hold alignment or take fastener preload are machined from stainless steel and aluminum.
The short shifter's chassis mount is CNC-machined 6061-T6 billet aluminum on every assembly, and its structural elements are metal whichever finish you choose. The double-shear selector rod uses machined aluminum clevis ends at both pivots for the same reason — the fasteners load metal, not composite.