If you have an older wrx like 05 and below , then yes it's worth it . The cats in the up pipe have been known to break apart and destroy the turbo. So save yourself the head ache of a possible turbo getting destroyed and get the up pipe. Can't do any harm . If you have an 06 wrx+ then u won't need the up pipe but from what I read on your thread I'm gonna guess u don't .