Ford Mustang Forum

Ford Mustang Forum (/forums/)
-   2005-2010 Mustang Talk (https://www.allfordmustangs.com/forums/2005-2010-mustang-talk/)
-   -   To drop cats or not to drop cats (https://www.allfordmustangs.com/forums/2005-2010-mustang-talk/125445-drop-cats-not-drop-cats.html)

dfournigault 07-14-2008 11:02 PM

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

SVT1995 07-14-2008 11:22 PM

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.

dfournigault 07-15-2008 08:26 PM

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.

BKid 07-15-2008 09:19 PM

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.

travelers 07-15-2008 09:22 PM

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,.

Oh welcome to AFM

jonballi 07-16-2008 07:36 AM

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.

My .$02

SVT1995 07-16-2008 06:17 PM

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!

stlwagon 07-16-2008 07:56 PM

852 Attachment(s)
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...

dfournigault 07-16-2008 09:22 PM

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!

stlwagon 07-16-2008 09:24 PM

852 Attachment(s)
If you go with an O/R pipe, get the H. Flowmasters do not sound good with an X pipe.

dfournigault 07-16-2008 10:11 PM

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...

stlwagon 07-16-2008 10:52 PM

852 Attachment(s)
Quote:

Originally Posted by dfournigault (Post 1092371)
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.

dfournigault 07-17-2008 01:58 PM

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...

Taxpayer 07-17-2008 04:01 PM

I wouldn't do it, keep it nice and legal. There must be some other way you can gain some more power.

stlwagon 07-17-2008 05:38 PM

852 Attachment(s)
Quote:

Originally Posted by dfournigault (Post 1093195)
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.


All times are GMT -4. The time now is 04:04 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.6.1
vB.Sponsors
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright © 2002-2015 All Ford Enthusiasts Network ™.

 
For the best viewing experience please update your browser to Google Chrome