Diffuser

Diffuser: 1500 mm ramp at 10° behind a flat floor, 400 mm wide, 3 fences

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, Xem Studio Design License — Xem Studio

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From the full sheet

Venturi tunnels (ground-effect floor): every size, notes, mating features and sources. How do venturi tunnels under a car create downforce?