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OBX T3 Turbo Inlet Flange | GT30 GT35 GT30R GT35R Stainless 4-Bolt Tapped | .5"
Genuine OBX Racing Sports F11668SS stainless steel T3 turbo inlet flange for custom turbo manifold, header, and exhaust fabrication. This is a thick undivided T3-pattern flange with a single rectangular turbine inlet opening and four threaded mounting holes. Each flange has been inspected and measured by Kuku Performance so buyers can compare the actual dimensions to their turbocharger or fabrication project before ordering.
- Flange Type: T3 undivided / single-port turbine inlet flange
- Material: Stainless steel with machined finish
- Overall Size: Approximately 107.63 mm wide x 67.11 mm tall
- Flange Thickness: Approximately 12.32 mm / 0.485 in - nominal 1/2-inch thickness
- Port Opening: Approximately 65.71 mm x 47.96 mm
- Mounting Pattern: 4 threaded / tapped mounting holes
- Bolt Center Spacing: Approximately 86.02 mm horizontal x 45.03 mm vertical, center-to-center
- Bare Flange Weight: Approximately 0.82 lb
- Manufacturer Part Number: F11668SS
Fitment: Designed around the standard undivided T3 4-bolt turbine inlet pattern. This is a universal fabrication component rather than a vehicle-specific direct replacement. This flange may be used with GT30, GT35, GT30R, GT35R, and similar turbocharger applications only when the turbine housing uses the standard T3 4-bolt inlet configuration. GT-series and other aftermarket turbochargers are available with different turbine housings and flange patterns, so please compare the measured bolt spacing, port opening, flange dimensions, and listing photos to your existing turbocharger or manifold before purchase.
What's Included: Select your preferred hardware option before purchase. The Flange Only option includes one OBX F11668SS stainless steel T3 flange. When the optional hardware kit is selected, the order includes one flange, four double-ended mounting studs and eight nuts. A gasket is not included.
Please Note: This is a weld-on fabrication flange. The flange is intended to be welded into a compatible turbo manifold, header, or custom exhaust assembly, while the turbocharger attaches to the four threaded mounting holes. GT30, GT35, GT30R, and GT35R references apply only to turbochargers using the standard T3 4-bolt turbine inlet housing. Because custom turbo systems and aftermarket turbine housings vary, do not rely on the turbo model name alone when determining compatibility. Use the detailed measurements and photos in this listing to confirm your application. Building a Custom T3 Turbo Manifold? Looking for another T3 fabrication component for your build? Check out our stainless steel 4-into-1 T3 turbo collector for custom turbo manifold and header fabrication.
Ideal for turbo manifold fabrication, replacement flange work, custom exhaust projects, and builders who want a thick stainless steel T3 inlet flange with documented dimensions instead of relying on generic catalog measurements. Professional welding and installation are recommended for fabrication applications.
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Shipping & Handling
We ship fast and we ship carefully.
- Orders are inspected, packaged, and ship same day or next business morning.
- Orders placed after 5:00 PM Central ship the following business day.
- Orders placed Friday after 1:00 PM Central are packaged and ready, with carrier pickup on Monday.
- Tracking uploads automatically as soon as your order ships.
- We ship via FedEx, UPS, or USPS depending on size and destination.
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We can create package deals for multiple items. Message us with what you’re trying to build.
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Details & Notes
- Monitor settings and lighting may affect color appearance.
- Hardware/accessories are included only if shown or stated.
- Please verify measurements, specifications, and fitment before purchasing.
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