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Old 03-30-2012, 04:08 PM   #121
FocusBoy58
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Hey focus boy. I am pretty new to the focus platform, I don't know where the cat is located at. I know in other cars that I have owned there had aftermarket high flow cats. Do you have a recommendation on putting something together that might work?

Nothing against you taking out your cat, I just feel a bit better trying to keep on in on my daily driver.
Any header change will get rid of your cat. Most aftermarket cats don't pass inspection
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Old 03-30-2012, 04:15 PM   #122
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Originally Posted by Gonzachus View Post
Hey focus boy. I am pretty new to the focus platform, I don't know where the cat is located at. I know in other cars that I have owned there had aftermarket high flow cats. Do you have a recommendation on putting something together that might work?

Nothing against you taking out your cat, I just feel a bit better trying to keep on in on my daily driver.
I have looked into this, you would have to mount the cat farther down than where it is stock, (attached to the header), my plan is to get a fswerks stealth exhaust and then replace the first muffler with a 2.5" hi flow cat.

edit: like focusboy said it probably still would not pass inspection, but you live in texas, so you will probably be fine.
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Old 03-30-2012, 09:55 PM   #123
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Not so worried about the inspection, although my Subaru legacy passed Cali inspection with a high flow cat.

I might look into your plan darkangelism.

Thanks for the input guys.
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Old 03-31-2012, 02:33 PM   #124
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Ok so I was under the assumption (which is never a good thing) that adding a CAI would somehow boost HP and a little MPG... So if I swap out the stock exhaust, keep the cat with a cat back system, would I get improved MPG's and also gain some HP? Averaging 30-34 depending on the driving condition, but no matter what it is an improvement from the 22-25 I was getting out of my previous car. I wanna improve everything without losing anything, lol. I like my fantasy world very much ;)
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Old 03-31-2012, 03:12 PM   #125
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Ok so I was under the assumption (which is never a good thing) that adding a CAI would somehow boost HP and a little MPG... So if I swap out the stock exhaust, keep the cat with a cat back system, would I get improved MPG's and also gain some HP? Averaging 30-34 depending on the driving condition, but no matter what it is an improvement from the 22-25 I was getting out of my previous car. I wanna improve everything without losing anything, lol. I like my fantasy world very much ;)
yes a less restrictive exhaust will boost mpg and add horsepower at all rpms. a CAI will add HP(most gains in high rpm), have little effect on mpg at low rpm and negatively affect at higher rpm. if you drive conservatively, a CAI is a waste of money, unless you want the engine to sound better.


However focusboy also removed the cat which helps mpg.
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Old 03-31-2012, 05:27 PM   #126
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Yep I understood he took the cat off. I have no plans to do that. I am not really a conservative driver, more of a "drive it like you stole it" ;)
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Old 03-31-2012, 08:55 PM   #127
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just read thru this whole thread.
i lol'd at the crazy responses.
I'm catless and still passed inspection.
props to the OP.
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