Stage 4 - Subaru WRX Forum
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post #1 of 4 Old 07-17-2005, 09:42 PM Thread Starter
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Stage 4

I am a newbie to the wrx scene(just got the car a week ago). I essentially have a stock wrx; I have 3” cat back and a BOV. I want to put a stage 4 on my car, for the added HP obviously. What sort if prep work, as far as parts do I need to do first?
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post #2 of 4 Old 07-18-2005, 11:20 AM
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to have a stage 4 car you need:
up pipe and downpipe to make that catback a turboback (helix, invidia, perrin)
upgraded turbo (IHI VF22 or VF34) there are tons of others but those are the most common used
STi 565 injectors or something on that level that will flow enough
Walbro fuel pump
Top mount or front mount intercooler (hyperflow, perrin, or spearco are commonly used)
short ram intake
last but not least engine managment (utec or ecutek are commonly used) wouldnt use the accessport inless you got the street tuner with it
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post #3 of 4 Old 07-18-2005, 07:25 PM
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Hyperflow.... TurboXS maybe?

*TBRex* 02 WRB WRX Wagon
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post #4 of 4 Old 07-19-2005, 08:11 AM
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i was having this argument with someone is hyperflow still with turbo xs?
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