Removing cats on a '98 mustang. - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 14 Old 02-02-2008, 12:26 PM Thread Starter
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Removing cats on a '98 mustang.

Can I remove the catalytic converter on a 1998 mustang without screwing up the computer? I can't remember if this car has an O2 sensor after the converter or not. If so, what do I need to buy (link if available) to trick the computer?

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post #2 of 14 Old 02-05-2008, 08:14 PM
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cats

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Originally Posted by Raceallday1 View Post
Can I remove the catalytic converter on a 1998 mustang without screwing up the computer? I can't remember if this car has an O2 sensor after the converter or not. If so, what do I need to buy (link if available) to trick the computer?
on a 01 we have it has dual sensors on it, tried to remove them and use
those elimators, well for me it didn't work and caused the check engine
lite to come on and could not keep it off, clear the code and it was right back so we but them back on .............., just split them behind the cats
and called it good .....................


82 gt w/93 cobra eng-trans x over + more
01 mustang 6cyl , gt wanna be
93 gt finished , another 93 gt going through the chop cut and rebuild process now
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post #3 of 14 Old 02-06-2008, 12:18 PM
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on my 98 i had removed the last 2 and no check engine light came on. not saying it wont come on on yours but on mine at least no light came on.
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post #4 of 14 Old 02-10-2008, 09:21 AM
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Sensors before/after cats came into being with OBDII - so most cars after 95 have them before and after, fwiw.

Michael Yount - Charlotte, NC - 82 Volvo 242 - 6.2L; '17 Mazda3; '16 CrossTrek
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post #5 of 14 Old 02-18-2008, 04:02 PM
 
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Yeah I did it and needed a chip to keep the light off.
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post #6 of 14 Old 02-18-2008, 04:05 PM
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not worth the hassle, get high flow cats
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post #7 of 14 Old 02-20-2008, 03:11 PM
 
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Yeah, it's going to sound like rice if you remove them completely anyway.
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post #8 of 14 Old 03-20-2008, 04:32 PM
 
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lol.....sound like rice not realy...i had the cats off and 40 flowmasters (yes check engine light came on after a day) i rolled with that for awhile people would think it was a gt so that was cool for awhile then i took the mufflers off and now it sounds like a v12! or something crazy people say it sounds good idk go figure lol...but riding with no o2 in the exhaust f up my mpg and made the car choke and spudder and bog but i got good power in 3rd/4th gear.....i was rolling around like that for awhile with no o2 made the car sound like it had a cam in it was cool but gas was killing do to that..i just recently took it to a exhaustm shop and had them make a whole for the o2 to go back and now my car is normal agian THANK GOD! and getting good MPG! and its still straight pipe still have some good power no choking(no check engine) and still has that crazy sound to it lol..so if u take cats off go put the o2 back in there lol!!!





headers..x pipe..straight pipe...no mufflers...u get...crazy formula one sounding v6 lol
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post #9 of 14 Old 03-30-2008, 03:40 PM
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headers..x pipe..straight pipe...no mufflers...u get...crazy formula one sounding v6 lol
....that will get you one gay sounding v6

93 lx...expensive hobby
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post #10 of 14 Old 04-04-2008, 03:59 PM
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....that will get you one gay sounding v6
x2

and im dieing to get mine back... i had LT headers and then pypes mini cats welded on a O/R H pipe with the 02 bungs and 02 sensors..... so im hoping im all set


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post #11 of 14 Old 05-02-2008, 11:54 AM
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MAC LT's, MAC O/R H-pipe and MAC Pro-dumps sounds good.

A little loud in the car, but the catback system with the pipes would take care of that.

MIL eliminators worked for me.

No.. I'm not "Fast."
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Simply awesome! Its like you came down from forum mountain with two stone tablets...
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post #12 of 14 Old 05-03-2008, 01:03 AM
 
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....that will get you one gay sounding v6
No...I took the exhaust (catback more accurately) off my car and it sounds like a high horsepower monster. The idle is loud and full power is ridiculously loud...so loud that the vibrations hurt your internal organs and ears after about 30 mins of driving. Although it was fun to drive near people on the sidewalk and rev the engine and watch them jump like 20 feet in the air lol.


umm you can use a hand-held tuner to turn off the o2 sensors behind the cats to avoid the check engine light but ur mpg maybe severely affected by this.
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post #13 of 14 Old 05-07-2008, 01:13 AM
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Turning off the downstream o2 sensors would have no effect on gas mileage.

They only detect the presence of the catalytics, not contribute to the a/f mixture.

No.. I'm not "Fast."
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Simply awesome! Its like you came down from forum mountain with two stone tablets...
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post #14 of 14 Old 05-07-2008, 01:45 PM
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No hassle. Turn the rear 02 sensors off in your tune.
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