Invidia Catless and Catted Downpipes for 02-07 WRX & STi

Invidia downpipes for the 2002-2007 Subaru WRX & STi are designed in a variety of configurations. Every Invidia WRX & STi downpipe features 3" diameter stainless steel piping, thick flanges, and a cast upper section for optimal flow and performance. This downpipe is available in a catless bellmouth, catless divorced, and high-flow cat equipped divorced design.

Divorced vs. Bellmouth Downpipes:

Divorced: A divorced wastegate downpipe has a plate the protrudes into the turbo to separate exhaust flow coming out of the turbo to give reduce turbulence. This is good for stock and smaller turbochargers; the protrusion does not work with some aftermarket turbos (i.e APS). 

Bellmouth: This design has a wide-open bell at the turbo, which is better for larger turbochargers with more flow. It will work fine with a stock or small turbo, but it is designed for scenarios where wastegate turbulence is not an issue.

The diagram to the left is a stock WRX turbo, so you can see how the turbocharger interacts with the Bellmouth and Divorced Invidia downpipe designs.

Invidia's catless downpipe will cause a Check Engine Light (CEL) on your WRX or STi. While this isn't harmful, it can be annoying and disables the cruise control -- you can use a software solution such as the Cobb Accessport to eliminate these codes or try a mechanical fix (O2 sensor spacer). The high-flow cat Invidia WRX & STi downpipe is not emissions legal, and may still cause a CEL. The high flow cat helps to reduce boost spiking on 2.5L cars.








FITMENT: 2002-2007 Subaru WRX & 2004-2007 Subaru STi


Recommended Parts: OEM Subaru Gaskets