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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 03-24-2009, 10:35 AM   #1
MidnightBlue5.0
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Default Putting long tubes onto a Fox

I currently have Mac equal length shorty headers with their cat'ed h pipe and mufflers/straight tips. I'm thinking of changing over to their long tubes and their 'off-road' h-pipe. There shouldn't be anything else I need to change correct? What other things should I need to know?

Will my check engine light be on if I get rid of my cats?
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Old 03-24-2009, 11:08 AM   #2
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well, the check engine light shouldn't go on if you have no cats, just make sure to have the little pipe thats connected near the middle of the H-pipe attached. Its an air injection tube or something? At least that's what happened to mine, i had that removed check engine light came on, then i connected it and it was fine.
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Old 03-25-2009, 07:33 AM   #3
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Can anyone offer up anymore info?
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Old 03-25-2009, 09:31 AM   #4
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Put the O2 sensors in the collector and you should be fine. It's never been and issue with the early models. The later models with 4 O2 sensors had to use Sensor Eliminators on the after cat Ho2's
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Old 03-25-2009, 10:00 AM   #5
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Oh alright, thank you.

Mine only has the 2 O2 sensors at the collector
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Old 03-25-2009, 10:51 AM   #6
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What kind of performance gains will I look at going from shortys with a cat'ed h pipe to long tubes with a catless h pipe? If any at all..
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Old 03-25-2009, 11:13 AM   #7
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13-20 hp gain is what it's claimed from stock to long tube headers, then about 10-15 from stock to o/r h-pipe. will be a slight increase in performance perhaps not the most noticeable, but it will sound quite a bit different. I'd say you'd get around 20 hp +-
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Old 03-25-2009, 12:24 PM   #8
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I noticed a big sound change going from shorty headers/off road H pipe to Lts and O/R X pipe.
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Old 03-25-2009, 12:27 PM   #9
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Good sound change? Or bad?
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Old 03-25-2009, 01:06 PM   #10
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Great. I don't think I notice it now so much since it's been installed for 2+ years. More raspy and late model sounding.
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Old 03-25-2009, 01:06 PM
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