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Discussion Starter #1
Hey everybody!!!how much HP would I gain changing both pipes on my 03 wrx please?I already have the muffler and intake on place?
Thanks.
 

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Only your tuner will be able to effectively answer that question. And unless you have a Cobb or AEM intake that works with the Cobb OTS maps then you will most certainly have to get a custom tune. FYI, the car should not be driven with an aftermarket intake that is not tuned for.
 

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Without a tune not a whole bunch......maybe 20whp.
 

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Discussion Starter #4
Thanks. Do you have any idea of how much more if tune?I'm Brasilian and Inever had a car like this before, so now I'm trying to have some fun working in my car making some modifications.
 

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Being in Brazil, I would look into running e85.. my tuner typically sees gains of +50whp and +70ft/lbs on an e85 tune compared to a 93 octane tune.
 
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