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OBX T3 T4 Turbo Inlet Adapter Flange Dual Pattern 3/8-16 Mild Steel F10747
Bring greater flexibility to your custom turbo build with the OBX Racing Sports F10747 T3/T4 dual-pattern turbo inlet adapter flange. Designed for turbo builders, performance enthusiasts and experienced fabricators, this compact mild-steel adapter combines standard T3 and T4 mounting patterns in one versatile component. It is an excellent foundation for T3-to-T4 turbo conversions, T4-to-T3 combinations, custom exhaust manifolds, forced-induction projects and one-off performance fabrication where accurate dimensions and dependable threaded mounting points matter.
- Brand and Part Number: OBX Racing Sports F10747; OBX product ID 40-9999-41.
- Construction: Bare, uncoated mild steel with measured overall dimensions of 107.9 x 94.6 x 10.7 mm (approximately 4.25 x 3.72 x 0.42 inches).
- T3 Bolt Pattern: Approximately 45.1 x 85.1 mm center-to-center (1.78 x 3.35 inches).
- T4 Bolt Pattern: Approximately 70.2 x 82.2 mm center-to-center (2.76 x 3.24 inches).
- Port and Mounting: Undivided single open port measuring approximately 55.3 x 44.2 mm, with eight threaded mounting holes and a verified 3/8-16 UNC thread specification.
This is a universal turbo fabrication component rather than a vehicle-specific replacement part. It may be used to connect a T3-flanged manifold to a T4-flanged turbocharger, or a T4-flanged manifold to a T3-flanged turbocharger, when the mounting pattern, center-port opening, available clearance and surrounding exhaust components match. It is intended for experienced turbo builders and custom fabrication applications.
What's Included: One OBX F10747 T3/T4 dual-pattern adapter flange, exactly as pictured. Turbocharger, exhaust manifold, studs, bolts, nuts, gaskets and other installation hardware are not included.
Please Note: Compare every listed measurement with your turbocharger and manifold before purchasing. This adapter adds approximately 10.7 mm of stack height, which may affect turbo placement, piping or downpipe alignment, oil-drain orientation and surrounding clearance. Verify fastener length, thread engagement, gasket compatibility and turbine-inlet shape before installation. The center opening is an undivided small-port design and is not intended for applications where separate twin-scroll exhaust passages must be maintained.
Whether you are assembling a compact street-turbo system, matching a different turbocharger to an existing manifold or creating a completely custom forced-induction setup, this dual-pattern T3/T4 adapter provides a practical solution for opening up more build combinations. Its bare mild-steel construction, threaded mounting-hole design and clearly documented measurements make it a valuable addition to any turbo fabricator's parts shelf. Professional installation and fabrication experience are strongly recommended.
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