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IAG Throttle Body & Adapter Plate Big Bore 76mm Throttle Body & Adapter for OEM STI/Cosworth Intake; Black

Fuel Injection Throttle Body


IAG Big Bore 76mm Throttle Body with Electronics and Adapter Package for OEM Subaru STI / Cosworth Intake Manifold; Black Finish.

  • Allows mounting of larger 76mm throttle body for increased airflow
Pricing: $379.99

Free ground shipping on all order over $100.00 (some exclusions may apply)


Subaru: WRX STI 13 - 21 Sport-tech / Tsurugi Edition / Launch Edition / Sport / Base / Limited / Series.HyperBlue / Kanrai Edition / STI / Type RA / S209, Subaru: WRX 12 - 16 STI, Subaru: Forester 04 - 08 Sports 2.5 XT / XT / XT Premium / XT Limited / 2.5 XT, Subaru: Impreza 04 - 14 WRX STI Special Edition / WRX STI Limited / WRX / WRX Limited / WRX TR / WRX STI

  • Adapter Kit Includes: (x1) 76mm Throttle Body with Electronics (x1) IAG Black Aluminum Adapter Plate, (x4) M6x50mm Low Profile Socket Head Cap Screws, (x4) M6x20mm Low Profile Socket Head Cap Screws, (x4) Small O-rings, (x2) Large Adapter Plate O-rings,
  • Big Bore Throttle Body with electronics is Silver in color
  • Custom piping / fabrication may be required for installation
  • ECU calibration is required - Consult with your Tuner before ordering.
  • Fitment Notes: Intended for vehicles making 600+ HP with front mount intercoolers
  • Fits 2004-21 Subaru STI, 2006-07 WRX, and the 2004-08 Forester XT. Consult with your tuner before ordering.
  • Not compatible with OEM style MAP sensors

In the hunt for more than 600 horsepower Subaru owners can be limited by their OEM throttle body. The OEM units just aren't big enough to meet the demands of larger upgraded turbochargers. For years those who were seeking to upgrade this component were forced to use inferior aftermarket alternatives. These aftermarket throttle bodies were prone to issues like sticking, poor idle quality, and difficult installation. IAG is pleased to announce that these owners are no longer forced to compromise drivability for horsepower. With the introduction of our new adapter plates owners are able to upgrade their OEM throttle bodies with a larger OEM quality unit. The Big Bore throttle body offers a 76mm bore which nearly 25% larger over stock. Best of all, the installation is much easier than other options previously available. Simply remove the OEM Subaru throttle body, install the supplied adapter and new 76mm Throttle body to the intake manifold. No complicated disassembly, no springs, and the OEM connector is plug and play. The IAG adapter plate is designed specifically to work with the OEM STI or Cosworth Intake Manifold. The plates are machined from 6061 aluminum, and feature an O-ring sealing surface. Each package includes a brand new Big Bore 76mm Throttle Body, IAG adapter plate, and all the necessary hardware to complete the installation. The adapter plates are available in anodized black. 


  • IAG-AFD-2027BK
  • IAG-AFD-2027BK
  • IAG Performance
  • New


Shipping Information

  • Item Requires Shipping
  • 3.1 lbs.
  • W5.5000” x H5.5000” x L9.7500”
  • Free ground shipping on all order over $100.00 (some exclusions may apply)

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