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(:groupheader:) Exhausts these days have [[Acronyms/CATs]] in, especially Impreza's. Most [[Acronyms/new age]] cars now have three CATs. Replacing these CATs with high-flow versions or removing them completely will improve performance. <:vspace> The diagram below shows the location (1), (2) and (3), of all CATs in new age cars. <:vspace> Attach:new_age_exhaust_system_schematic.gif"New Age Exhaust System Schematic" | %center%'''New Age Exhaust System Schematic''' <:vspace> !! High-flow performance CATs <:vspace> These are usually the best option however can be expensive. <:vspace> !! Decat OEM pipes <:vspace> This is an inexpensive way to decat your existing exhaust. You have two options: <:vspace> * Purchase an aftermarket CAT replacement pipe or * Decat your own OEM exhaust(:groupfooter:) <:block>