Invidia 3in Downpipe to 2.5in Exhaust Adapter – Subaru Models (Inc. 2008-2021 Subaru WRX / STI / 2004-2010 Forester)

3-Inch Downpipe to 2.5-Inch Exhaust Adapter for Subaru Models

The Invidia 3-Inch Downpipe to 2.5-Inch Exhaust Adapter connects an aftermarket 3-inch downpipe to a 2.5-inch cat-back exhaust system on Subaru platforms, the reverse direction from the stock-to-3-inch adapter. Correct for builds using a 3-inch performance downpipe with a 2.5-inch cat-back.

DETAILS

• Adapts 3-inch downpipe to 2.5-inch cat-back
• Stainless steel construction
• Subaru platform specific

The diameter mismatch between a 3-inch aftermarket downpipe and a 2.5-inch cat-back inlet is a common issue in phased Subaru builds. The Invidia adapter bridges this cleanly without custom fabrication.

Verify the inlet and outlet diameters of your specific downpipe and cat-back before ordering, this adapter goes 3-inch inlet to 2.5-inch outlet, not the reverse.

What’s in the Box

• Exhaust adapter
• Clamps or hardware as applicable

Why Choose Invidia

Invidia has been manufacturing performance exhaust systems in Japan since 1999, and in that time they have built a reputation that carries real weight in the tuning community. Every system is manufactured using SUS304 stainless steel and mandrel-bent tubing, which eliminates the flow restrictions and weak points that crush-bent alternatives introduce at every corner. Their in-house engineering team designs each application from scratch rather than adapting a generic template, which is why Invidia fitment is consistently tighter than the competition. The result is an exhaust that installs cleanly, seals correctly, and lasts. Invidia backs their products with a quality standard that is visible in the finish, the weld quality, and the hardware, details that reflect over two decades of refining the same core manufacturing process.

The RallySport Take

The 3-inch to 2.5-inch adapter for Subaru, the clean solution for builds where the downpipe and cat-back use different diameters. Order the correct direction for your application. Universal for Subaru platforms with a 3-inch performance downpipe and 2.5-inch cat-back inlet.

Fitment