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Old 05-07-2010, 11:01 AM   #1
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Roush Exhaust Manifold

So I know that the Roush exhaust manifold isn't the best thing in the world. ;) So I was wondering if it would be beneficial to port the thing? I know tubular would be the way to go, however I have the roush kit and I'm looking to keep it bolt in and strait forward. Any advice? Thanks!


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Old 05-07-2010, 11:11 AM   #2
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No its not the best but what are your power goals.
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Old 05-07-2010, 11:24 AM   #3
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well, I wanted to run about 10-12lbs. Ill be running stock block/internals, Full 2.5inch exhaust including ORP. Borla catback. Looking for around 275 FWHP. In the next few months I will be upgrading the intake manifold to something more suited toward forced induction.

But before I install everything I was just wondering if I could clean up the manifold a bit.

-- Cam
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Old 05-07-2010, 11:48 AM   #4
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On my old roush manifold there really wasnt anything to clean up, its a pretty decent manifold i would just leave it
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Old 05-07-2010, 11:59 AM   #5
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Agree , I would just use it as it is , I have made over 400HP with the manifold in stock form , I also for what your doing would leave the stock Intake manifold it works great for Boost

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Old 05-07-2010, 12:27 PM   #6
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Yup just use it. It will be all you need.
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Old 05-07-2010, 02:59 PM   #7
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ok cool. while im on this subject of intake manifold. For forced induction, isnt it better to have shorter runner legth? so would it be possible to leave the IMRC "open" or the short runner position? OR am I just blownin steam out me ass. :)
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Old 05-07-2010, 03:49 PM   #8
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You don't want to mess with the DSI. It works very well as it is.
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Old 05-07-2010, 04:11 PM   #9
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You don't want to mess with the DSI. It works very well as it is.
Im talking about the IMRC. Not the DSI
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Old 05-07-2010, 04:17 PM   #10
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Do you really not understand that...?

DSI = dual stage intake. The IMRC is *part* of the DSI, holy crap. If you mess with the IMRC you are directly messing with the DSI.

There is no need to mess with it. Tom will tell you that over and over.
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