Invidia offers downpipes for the 2002-2007 Subaru WRX & STI that are designed in three different configurations. Every Invidia WRX & STI downpipe features 3" diameter stainless steel piping, thick flanges, and a cast upper section for optimal flow, performance, and longevity.

Invidia's catless downpipes will cause a Check Engine Light (CEL) on your 02-07 WRX or STI. While this isn't harmful, it can be annoying and disables the cruise control, but you can use a software solution such as the Cobb Accessport to eliminate these codes and make more use of the newly available performance the Invidia downpipes offer. The high-flow cat Invidia WRX & STI downpipe is not emissions legal, and may still cause a CEL, but it does help to reduce boost spiking on 2.5L cars.

The Invidia Bellmouth Downpipe for the 02-07 WRX & STI is designed to maximize exhaust flow on larger, aftermarket turbos. It has a wide-open bell at the turbo, which can increase turbulance in when connected to a smaller (stock) sized turbo; it will work with a stock or small turbo, but it is designed for scenarios where wastegate turbulence is not an issue.

The Invidia divorced wastegate downpipe for the 02-07 WRX & STI has a plate the protrudes into the turbo exhaust housing to separate exhaust flow which reduces turbulence. The divorced type of downpipe housing is good for stock and smaller turbochargers; the protrusion does not work with some aftermarket turbos (i.e APS).The divorced Invidia downpipe is available with a high flow cat or completely catless.