Another exhaust question - Subaru WRX Forum
 
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#1 Old 01-23-2013, 07:10 AM
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Another exhaust question

I know its another silly question from a noob and seems like im .

If i want to get a bigger catback like maybe 3" do i need to upgrade the down pipe or will the 3" fit on the stock part? I heard that the stock pipes where 2.5 that's why im wondering.

I also heard from someone i know it could be nonsense but having 2 different size pipes could take away back pressure and lose HP? ? ? I tried looking it up but im sure it could just be nonsense i over heard.

thanks guys n or girls.
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#2 Old 01-23-2013, 07:18 AM
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Just pick up a grimmspeed 2.5 to 3" adapter, it will make sure you won't create a exhaust leak when pairing the two together.

No I don't believe that is true, but I could be wrong.
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#3 Old 01-23-2013, 09:02 AM
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2.5 to 3 is ok. Until you get a "stage 2" tune, it will be ok.

Paul
2007 XT
2007 MS3
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#4 Old 01-23-2013, 10:47 AM
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Hooray for temporary cheap fixes!

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#5 Old 01-23-2013, 11:32 AM
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ok so if i get greedy and not buy the adapter it will still work that's good to know.

I dont think im going to stage 2
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