i have a 2004 Subaru Impreza WRX, i want to get a turbo back exhaust that gets approximately 25 HP, if i added an up pipe with that, what would the HP gain be if any?
the turbo back exhaust comes with a down pipe, so i'm asking about an up pipe and if there are any other advantages what are they?
That guy above me must not know wrx's...
You won't get too much HP from the uppipe, but boost will be much quicker. It's also a grand idea to change out the uppipe to a non catted uppipe because any added boost from stock pressure could cause your cat to be damaged and then; damaging your turbo. With the downpipe and 'cat back' exhaust you will notice a lot of gains. Especially from the downpipe, it's a wonderful feeling!
All-in-all; if you are doing your exhaust on a WRX and are going for turbo back, definitely change out that uppipe!
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