Catalytic Converters?

**99TransAmSLP** · 01-19-2009, 07:50 PM

Can you take off your catylic converters and not mess any of the sensors up??

**FuriousGeorge** · 01-19-2009, 08:30 PM

do you plan on taking your cats off for good or just replacing them? if you're taking them off completely, you're going to pop a code for your rear O2 sensors which can be tuned out. but if you're replacing them, just put the rear O2 sensors back into the new cats and they'll be fine.

**RyanJM** · 01-19-2009, 10:17 PM

When I had my long tubes and ORY done the guy plugged his laptop in and deleted the rear O2 sensors(or so he said) and I had no dash lights and my car will pass OBD2 plug in state inspection as long as I go to a station that doesn't look under the car.

**mark21742** · 01-20-2009, 12:15 AM

exactly what they said. if you take the cats off and do not get the rear o2s tuned out your check engine light will come on (low catylist code)....i ran mine like that for about 4 months with no problems before I tuned my car.
you don't really delete the rear o2s from the computer, you set the computer to not report it as an error

**99TransAmSLP** · 01-20-2009, 12:55 PM

well I want to get headers and a y pipe

**suede** · 01-20-2009, 01:08 PM

Well you got 4 options........

Option 1... do as above and get the rear O2's tuned out (probably best way b/c you will need your ecu reprogramed to get it running at its best)

Option 2... Find some O2 simulators, and put them on, but you may haveto do some looking b/c somone said they arent makeing them anymore... but if your electronicly handy they can also be made with resistors....

Option 3... leave them on and zip tie them up somewhere so they will read "cleaner" ambient air, then they will probably not throw a code unless they are the style that sense temp, but this will still keep the motor from going into limp mode

Option 4... weld in a rear bung into your y-pipe (further back is best) and get i believe its a spark plug extension but it brings the plug out of the main stream of gas and less gas thus making it think that everything is working just fine..

**99TransAmSLP** · 01-20-2009, 01:57 PM

hmm I might just leave them in and get high flows when I get headers

**02superfly** · 01-27-2009, 09:34 AM

did you ever take the catylic converters off of your car if so how did it run

**99TransAmSLP** · 01-27-2009, 12:28 PM

Nahh I havent yet but I will prolly just put some high flows on so it wouldnt mess anything up

**mark21742** · 01-27-2009, 04:08 PM

Originally Posted by 99TransAmSLP

Nahh I havent yet but I will prolly just put some high flows on so it wouldnt mess anything up

just to warn you, sometimes the high flow cats still throw a code, but you need them to pass a visual inspection.....id get the high flows and have the rear o2 reporting turned off by a tuner when you get the headers on and car tuned for them

**Ryans99LS1** · 01-27-2009, 04:26 PM

or the option i went with (due to inspections). I have headers and a off road y. Since they look under the car here, i some old cats, gutted them, welded them about where the stockers were and had the rear O2's turned off.

**99TransAmSLP** · 01-27-2009, 04:30 PM

Well I just got a new trans am lol

**SandmanWs7** · 01-27-2009, 04:35 PM

I took my cats off months ago and no problems. Also dont have the AIR and EGR on any more...been like a year. Still have Check Engine light on. Will get a tune sometime this spring

**suede** · 01-27-2009, 04:42 PM

Originally Posted by SandmanWs7

I took my cats off months ago and no problems. Also dont have the AIR and EGR on any more...been like a year. Still have Check Engine light on. Will get a tune sometime this spring

this is what i have done also....

**SandmanWs7** · 01-27-2009, 04:45 PM

Oh...also have Long Tube headers and a y pipe "with" cats. Cats are guttet, just for looks in case THE MAN takes a peek underneath.

**Boomer Sooner** · 01-27-2009, 07:13 PM

Originally Posted by 02superfly

did you ever take the catylic converters off of your car if so how did it run

I had mine cut off and had a pipe put in place of mine 3 years ago when I first got me z. Up to this day I've had no problems as a result. Yes, my SES light is on as a result, but that does not bother me.

**99TransAmSLP** · 02-07-2009, 10:59 AM

See I wanna take my cats off without that light coming on

**INMY01TA** · 02-07-2009, 04:39 PM

Just get them tuned out. Even if your gonna run high flows with long tubes it's still a good idea. Often with long tubes and the cats being further downstream they won't heat up as high which can lead to codes being thrown. Having them tuned out your car will basically pass emmitions for the rest of it's life. They can be tuned out via a mail order tune if need be.