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MX-5 Miata NA Randall Cowl Bulkhead Intake

MX-5 Miata NA Randall Cowl Bulkhead Intake preview

Files (4)

MX5_Intake_Bulkhead_Adapter-57mm.stl
STL
136.8 KBPrimary file
MX5_Intake_Bulkhead_Adapter-63mm.stl
STL
136.8 KB
MX5_Intake_Bulkhead_Adapter-70mm.stl
STL
136.8 KB
MX5_Intake_Bulkhead_Adapter-76mm.stl
STL
136.8 KB

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PETG filamentAmazon · Affiliate linkAmazon product page for 1.75 mm PETG; confirm colour, spool size, print temperature, seller, and delivery region.Check price at Amazon
ASA filamentAmazon · Affiliate linkAmazon product page for 1.75 mm ASA; use an enclosure and suitable ventilation, and confirm seller and regional availability.Check price at Amazon

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CC BY-SA
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The file license permits commercial reuse, subject to any applicable attribution or share-alike terms. License status does not verify vehicle fitment, OEM rights, design patents, or safety.

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Description

This design is heavily inspired by danobrien's design which replaces the non-ABS washer bottle and uses it's bolt holes in the firewall. This is my own design as I required a smaller adapter to fit 57mm/2¼" piping to connect to the stock airbox. It's currently a work in progress but my prototype did fit perfectly (see image) but the larger sized adapters might need adjustments to clear the weld lines, so I've provided the FreeCAD project file. 57mm / 2¼" piping 63mm / 2½" piping 70mm / 2¾" piping 76mm / 3" piping

Compatible Vehicles

Published Jun 26, 2026Updated Oct 29, 2026

Originally published on thingiverse.com by Jacob Foster (Eunos) · License: CC BY-SA

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