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evo x downpipe gains?

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Old Sep 11, 2009, 04:57 PM
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evo x downpipe gains?
does anyone know the average power gains you will get with an aftermarket downpipe if your running the stock cat?
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Old Sep 11, 2009, 05:38 PM
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No.
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Old Sep 11, 2009, 07:17 PM
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anywear from 8 to 15 whp
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Old Sep 11, 2009, 07:40 PM
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Yeah anywhere up to 20 hp. It depends on the other mods though too...
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Old Sep 11, 2009, 07:42 PM
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according to AMS, upgrading the downpipe will gain.... 0 horsepower
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Old Sep 11, 2009, 08:00 PM
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Are you asking about the downpipe or the downpipe + O2 housing?
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Old Sep 11, 2009, 08:06 PM
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I was assuming #2
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Old Sep 13, 2009, 02:02 AM
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even if it was an o2 housing replacement, with the stock cat, the restriction is still 100% there.. IMHO, 0 HP gain.
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