Invidia Equal Length Race Exhaust Manifold – Subaru Models (Inc. 2005-2021 STI / 2008-2014 WRX)

Equal Length Race Exhaust Manifold for Subaru WRX and STI Models

The Invidia Equal Length Race Exhaust Manifold for Subaru WRX and STI models replaces the factory unequal length manifold on EJ-series horizontally opposed engines. Equal length primaries eliminate exhaust pulse interference between cylinders, significantly improving exhaust scavenging and midrange power on the turbocharged boxer four.

DETAILS

• Equal length primary tube design
• Four-into-one collector
• 304 stainless construction
• Eliminates exhaust pulse interference
• Significant midrange power improvement

On a turbocharged horizontally opposed engine like the EJ, equal length headers improve exhaust scavenging efficiency before the turbocharger inlet. The turbine wheel sees more consistent exhaust gas flow, which spools the turbo faster and more smoothly. Power gains are consistently substantial in the midrange where the factory manifold’s pulse interference is most impactful.

The equal length manifold pairs naturally with a full exhaust system build including Invidia up-pipe and downpipe for complete exhaust optimization from manifold to tailpipe.

What’s in the Box

• Equal length exhaust manifold
• Gaskets
• Mounting hardware
• Installation instructions

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 equal length race manifold is one of the most impactful single modifications available for EJ-series Subaru builds. We recommend it for any build targeting serious power. Fits 2005+ WRX STI, 2008-2014 WRX, and 2008-2013 Forester XT with EJ-series engines.

Fitment