HKS Catless Bellmouth Downpipe WRX / STI (2002-2007) Honda The complete system is mandrel-bent

The complete system is mandrel-bent for consistency and precision

bounce off the walls of the reflection chambers

500 mile break-in highly recommended with this set-up

it's too loud for you

- This inverted cone design provides a filter with more surface area to provide better air filtration for the engine but still allows maximum air flow

HKS Catless Bellmouth Downpipe WRX / STI (2002-2007) Honda The complete system is mandrel-bentThis HKS 3 inch catless downpipe with a cast bellmouth design for the 2002 2007 Subaru WRX and STI is constructed from polished SUS304 stainless steel piping and is mandrel bent for the smoothest flow. An upgraded downpipe coupled with tuning is definitely one of the best ways to increase power. NOTE: This catless downpipe is for offroad use only.