To drop cats or not to drop cats - Ford Mustang Forum
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post #1 of 33 (permalink) Old 07-14-2008 Thread Starter
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To drop cats or not to drop cats

Hi everyone... I'm new to the Mustang forums. I have a 2005 Mustang GT Redfire 5 speed. I have just installed a K&N FIPK 57-2565 Cold Air kit and Flowmaster American Thunder axelbacks. I'm contemplating dropping the cats in favor of an off road H pipe. What issues should I be aware of with regard to the MIL sensors for the O2 CAT sensors? I would like to do a bolt on/off pipe, as I live in an emissions testing state, and will need to swap them out for testing. Look forward to recommendations

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post #2 of 33 (permalink) Old 07-14-2008
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Do you have your stock heades on? If so just switch it back when the time comes for testing.
If you drop your cats you'll get a "code" because of it. That can be stopped by getting tune.


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post #3 of 33 (permalink) Old 07-15-2008 Thread Starter
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Yes, I do have the stock headers. That was my thought, getting a programmer and swapping the cats in and out when emissions testing comes every couple of years.
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post #4 of 33 (permalink) Old 07-15-2008
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I would get a SCT tuner from Doug at Bamachips.com and that way you will get a lot more power. You will also get free tunes for your new bolt ons.

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post #5 of 33 (permalink) Old 07-15-2008
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You can have a tune for emissions that turns the rear cats back on when you need to have it tested. But with the O/R H you can have another tune that turns the rear 02s off. If not you'll get a cel code,.

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post #6 of 33 (permalink) Old 07-16-2008
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I don't think it's worth it to remove your cats. You will make better power on other mods. Not only that all you will be doing is making our air dirty. Our cars have pretty good exhaust for a factory vehicle. The only real gain in exhaust would be to install long tubes with cats. There you will notice a nice increase.

I'm "green" and I'm making more power than guys here with off road exhaust. Proof positive you can make clean power.

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post #7 of 33 (permalink) Old 07-16-2008
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I took the cat's off ( alittle gain can't tell but I like the sound better). It kinda dirty's the air but it's no worse then seeing a 18 wheeler blowing black smoke everywhere!

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post #8 of 33 (permalink) Old 07-16-2008
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If you get rid of the cats, you'll get a P0420/P0430 (catalyst efficiency) code. It won't affect performance but is annoying. Only way to get rid of it is with a tune or mil eliminators...

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post #9 of 33 (permalink) Old 07-16-2008 Thread Starter
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I've also considered hi-flow cats, as I'm not against preserving the environment. I'm looking for a bit more sound out of my Flowmasters, which an O/R H or X will give me. You folks who have programmers/tuners, any recommendations such as from BKid there are more than welcome. And thanks for the AFM welcome!
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If you go with an O/R pipe, get the H. Flowmasters do not sound good with an X pipe.

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post #11 of 33 (permalink) Old 07-16-2008 Thread Starter
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I was leaning toward an H if I do on O/R pipe... I wonder if I should get a separate set of O2 sensors so I wouldn't have to go back and forth with the same ones...
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Quote:
Originally Posted by dfournigault View Post
I was leaning toward an H if I do on O/R pipe... I wonder if I should get a separate set of O2 sensors so I wouldn't have to go back and forth with the same ones...
Your car has 4 HO2S, two before the cats and two after. The upstream O2s control air/fuel inputs to the PCM. The rears only measure catalyst efficiency.

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post #13 of 33 (permalink) Old 07-17-2008 Thread Starter
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Sorry... my bad. I meant if I go o/r pipe, should I get a 2nd set of sensors, and leave the existing ones in place with the cats... just plug and play so to speak...
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I wouldn't do it, keep it nice and legal. There must be some other way you can gain some more power.

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Quote:
Originally Posted by dfournigault View Post
Sorry... my bad. I meant if I go o/r pipe, should I get a 2nd set of sensors, and leave the existing ones in place with the cats... just plug and play so to speak...
Not sure I understand... The o/r pipe still has bungs for all 4 sensors. But you should still have the rears disabled.


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