If you're looking to really unleash the potential of your Subaru's EJ engine, the Torque Solution Big Bore 76mm Throttle Body Adapter is a game changer. This isn't just another part; it's a serious upgrade that lets you swap in a Toyota 76mm big bore throttle body. Why? Because it gives you a 25% increase in size over the stock setup, and trust me, you’ll feel that difference when you hit the gas.

Crafted from CNC'd 6061 billet aluminum, this adapter is built to last. We anodize it to keep corrosion at bay, so you won’t have to worry about it degrading over time. Plus, it comes with O-ring gaskets that ensure a leak-free seal—no one wants to deal with pesky air leaks when you're trying to maximize performance.

What’s in the Box?

• Billet Spacer (1)
• Large O-ring (2)
• Small O-ring (4) to keep those M6x20 screws snug on the spacer
• M6-1.0 x 20 Low Profile Zinc Socket Cap Bolt (4) to secure the spacer to the intake manifold
• M6-1.0 x 50 Stainless Steel Socket Cap Bolt (4) for attaching the throttle body to the spacer
• M6 Zinc Flat Washer (4) for the TB to spacer connection
• Rivet (7) to attach the OEM TB motor to the big bore TB
• M4 Nylock Nut, which acts as a rivet spacer tool for the motor cover near the harness plug

Fitment

This adapter is a solid fit for a range of Subaru models, including:

• Subaru STI from 2004 to 2021 (just make sure you have the 2006+ riveted throttle body)
• Subaru WRX 2006-2007
• Subaru WRX (with a compatible intake manifold) from 2008-2014
• Subaru Forester XT from 2004-2008

A Few Things to Keep in Mind

• This is meant for high horsepower builds, so make sure your setup can handle it.
• Before you dive in, have a chat with your tuner to ensure they can work with this throttle body setup.
• You’ll need to transfer the motor from a Subaru DBW throttle body found on the 2006-21 STI, 2006-07 WRX, or 2004-08 Forester XT.
• Don’t forget about your FMIC piping—some modifications might be necessary here.
• A new transition coupler and clamp will be required to connect the big bore TB (3.5 in.) to your existing piping.
• Be prepared to upgrade your MAP sensor and relocate it to the intake manifold or a vacuum block.
• Your tuner will need to adjust your tune for both the big bore TB and the aftermarket MAP sensor.

Just a heads up—some of the pictures show the adapter installed on a Torque Solution Intake Manifold, but that’s just for reference. If you’re serious about performance, this adapter is a solid investment. It’s all about getting the most out of your Subaru, and with this setup, you’re definitely on the right track.