Stage 2 mods? - Subaru WRX Forum
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#1 Old 08-31-2013, 11:12 PM
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Stage 2 mods?

Do I need to delete the cat in my uppipe to go stage 2?
Also is a new downpipe manditory?
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#2 Old 08-31-2013, 11:37 PM
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I believe the cat deletion is not necessary, but the down pipe is, check the Cobb notes for the map u r using if u r using a Cobb ap. to go to stage 2. Most ppl will recommend the up pipe deletion tho, I assume your year has the cat.
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#3 Old 09-01-2013, 05:16 AM
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^correct. Stick to the map notes if using a ots map.

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#4 Old 09-01-2013, 08:39 AM
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Yes, an up-pipe is absolutely required for stage 2 and up.
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#5 Old 09-01-2013, 10:41 AM
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If it was absolutely necessary Cobb would have it in their map notes which, I saw no mention of. Very very highly suggested but not absolutely necessary, unless I overlooked something in the notes. Personally I would make it my first mod, even before a catback.

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#6 Old 09-01-2013, 01:54 PM
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A basic Stg. 2 car consists of Turbo back exhaust, which includes, DP and a cat back exhaust. I highly recommend removing the catted up-pipe and replacing it with one from either a 04-07 STI, 06-07 WRX, LGT, FXT or an aftermarket one. Then of course you'll need a tune and how ever you do that is your choice, Cobb AP, Open source or some other form of EM.

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#7 Old 09-02-2013, 07:32 AM
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Quote:
Originally Posted by boo-key bear View Post
If it was absolutely necessary Cobb would have it in their map notes which, I saw no mention of. Very very highly suggested but not absolutely necessary, unless I overlooked something in the notes. Personally I would make it my first mod, even before a catback.
People have also lost motors due to advice on Cobb products that they did not give.

It is absolutely required. A catted up-pipe while stock is a bad idea. Higher stage 2 EGTs will eat that cat, and he will end up replacing both it and his turbo sooner rather than later.
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#8 Old 09-06-2013, 06:07 PM
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