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Old 03-18-2013, 10:37 AM   #1
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Taking off Cats

Would the check engine light turn on if I take out the two back Cats since the sensors are connected to the two front ones? I've heard it and its louder and the persons check engine light didn't go on?
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Old 03-18-2013, 10:41 AM   #2
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Would the check engine light turn on if I take out the two back Cats since the sensors are connected to the two front ones? I've heard it and its louder and the persons check engine light didn't go on?
Yes it does go on if the O2 sensors are removed. There is a couple of ways to go about this, you can drill holes in the piping to fit the sensors and then weld them on. Also there is another method having to do with MIL eliminators, but I'm not familiar with that so maybe someone can chime in.
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Old 03-18-2013, 10:45 AM   #3
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Would the check engine light turn on if I take out the two back Cats since the sensors are connected to the two front ones? I've heard it and its louder and the persons check engine light didn't go on?
Most probably it will come on. It may not be immediately. But, you can get MIL elliminators that you plug in that will turn the check eng light off. If you have a tuner, you can also make it so the tuner turns the check eng light off too.

Plug-in MIL Eliminators (96-04 All)
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Old 03-18-2013, 11:04 AM   #4
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The sensors are on the front two cats

The guy that showed me took off the back two cats with no sensors that's why his check engine light didn't turn on.
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Old 03-18-2013, 11:21 AM   #5
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I was thinking about doing this as well and from my knowledge, the back cats don't effect the oxygen sensors at all. All they do is measure how well the front cats work so it shouldn't cause an engine light if u get rid of them. Although I think I'm going to switch for some high flow cats
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Old 03-18-2013, 11:38 AM   #6
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Yes the light goes in and the exhaust sounds gets LOUD! But not a good loud a very raspy nasty loud, not mustang like. I know in some states you can get away without cats but not mine.
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Old 03-18-2013, 11:55 AM   #7
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Shouldn't throw check engine light since you'll still have your front cats.
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Old 03-18-2013, 12:36 PM   #8
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I have a 2000 gt with the back two cats removed, its been 3 months and no CEL
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