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Old 09-10-2013, 02:26 PM   #1
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2011 stock exhaust manifold

hello everyone.

this has been on my mind for a wile and is probably a stupid thing to do but has anyone hallowed out they're cat on the manifold? would that make it have better flow like a header. and then just do the second o2 sensor delete with the tuner? if anyone knows about this im kinda interested


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Old 09-10-2013, 07:19 PM   #2
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hello everyone.

this has been on my mind for a wile and is probably a stupid thing to do but has anyone hallowed out they're cat on the manifold? would that make it have better flow like a header. and then just do the second o2 sensor delete with the tuner? if anyone knows about this im kinda interested
If your trying to get your mani/cat flowing= Why not just get a '05-'07 ST mani/cat? Its the best flowing one out there. You could have your tune w/ the rear o2 delete. I'd also have the egr deleted too.
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Old 09-11-2013, 07:07 AM   #3
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i thought they were all gonna be the same design. I just don't have the money for a header right now so this kinda got me thinking.
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Old 09-11-2013, 10:07 AM   #4
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i thought they were all gonna be the same design. I just don't have the money for a header right now so this kinda got me thinking.
Compare a 23 st w/ the 20 log style mani/cat.
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Old 09-11-2013, 11:34 AM   #5
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would that bolt right up to my car?
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Old 09-11-2013, 01:57 PM   #6
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would that bolt right up to my car?
It would...if you notice on aftermarket headers, they list 2.0 and 2.3 as the same model. Switching from a 2.0 to a 2.3 stock header would be the same. So check the junk yards for ST's and 03-04's with the 2.3

Plenty come up for sale in the buy/sell section for good prices:
http://www.focusfanatics.com/forum/s...archid=7385549
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Old 09-11-2013, 07:13 PM   #7
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Try to find a 2.5 Fusion exhaust manifold, it is not a mani-cat.
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Old 09-12-2013, 06:57 AM   #8
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that 2.5 fusion should bolt right up shouldn't it? everything is almost the same on those cars compared to my 2011?
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Old 09-14-2013, 10:46 AM   #9
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Yes it bolts right up.
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Old 09-16-2013, 02:36 PM   #10
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ill have to look into that. I would also need to either tune the rear o2 sensor or get a spark plug non fouler?
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