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08-14-2008, 02:32 PM #1
- Join Date
- Mar 2008
- Location
- Manitowoc, WI
- Posts
- 7
Purple- 1998 Pontiac Trans AM
Replace Catalytic Converters or Lose Them?
The stock catalytic converters are shot on my 98 Pontiac Trans Am six speed. I was thinking about replacing them with high flow cats or could I just lose them? I would like lose them to make it louder but is their O2 sensors in it? If I should keep cats on it what type of high flow ones are best? Right now I have three inch maganaflow exhaust from the cats back and the cats up is stock.
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08-14-2008, 02:48 PM #2
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08-14-2008, 03:56 PM #3
You can just loose them, all that will happen till you turn the o2's off is your SES light will be on but it won't affect performance.
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08-14-2008, 03:57 PM #4
Okay, I perfer no cats. I have o2 sims in for now until header time. The car runs a 100% better and smells like muscle (IMO). However like BigGuns said. You won't pass inspections without em, if you live in a state that requires it. Oklahoma doesn't currently. My car is very quiet at low rpm but will blow eardrums when pushed. Totally about how much want to spend bro. Cats are not cheap.
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08-14-2008, 04:05 PM #5
well depends does your city have emissions testing? if not id say buy a set of headers and a ORY and toss the cats
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08-14-2008, 05:00 PM #6
Just called my ASE certified mechanic/manager at Midas who takes care of exhaust. He said that next spring when I'm ready to put the headers on, we will keep the CATS. He has some step up versions of stock but, not high flow type.
He said that high flow type were a waste of money and he has never experienced any gain from them.
When I gave him his choice between Pacesetter or Hooker headers, he chose Hooker headers because they were easier to install without bend probs etc. I've heard good things about pacesetters but, not too much about Hooker.
Anyway, long story but, I'm going to keep the CATS and just get some upgraded ones.
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08-15-2008, 03:39 PM #7
- Join Date
- Mar 2008
- Location
- Manitowoc, WI
- Posts
- 7
Purple- 1998 Pontiac Trans AM
i would rather lose the cats and i dont have to pass emissions in wisconsin. but how would i shut off the o2 sensors?
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08-15-2008, 08:01 PM #8
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08-15-2008, 08:52 PM #9
- Join Date
- Oct 2007
- Location
- Beaver Dam KY
- Posts
- 7,745
79 T/A -91 Firebird- 1998 Trans Am -Oynx Black
Sims are worthless. Just get the light shut off. Most places will do the tune for !EGR !AIR !CATS for 75 bucks or less.
I rock out with my SES light on..lol
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08-15-2008, 09:01 PM #10
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08-15-2008, 09:06 PM #11
- Join Date
- Oct 2007
- Location
- Beaver Dam KY
- Posts
- 7,745
79 T/A -91 Firebird- 1998 Trans Am -Oynx Black
How long have you had them?
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08-15-2008, 09:10 PM #12
- Join Date
- Mar 2008
- Location
- Oklahoma City, OK
- Posts
- 55
Bright Rally Red- 2002 Camaro SS
Don't put cats back on your car. Robbing you of power!
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08-15-2008, 09:12 PM #13
Goin on 2 weeks lol. I've heard of them giving trouble after a few years, but I will have them tuned out long b4 that ever happen. I'm going to do a few more mods then take it to get it tuned, and the codes erased.
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08-15-2008, 09:13 PM #14
- Join Date
- Oct 2007
- Location
- Beaver Dam KY
- Posts
- 7,745
79 T/A -91 Firebird- 1998 Trans Am -Oynx Black
sweetness
BTW to the OP
if you dont have emission then get rid of them and SELL THEM!
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08-15-2008, 09:13 PM #15
- Join Date
- May 2008
- Location
- Verdigris, OK
- Posts
- 2,165
NBM- 99 z28
no cats here. i'll never have cats agian on my z
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08-15-2008, 09:15 PM #16
- Join Date
- Mar 2008
- Location
- Oklahoma City, OK
- Posts
- 55
Bright Rally Red- 2002 Camaro SS
Think of it this way...you are spending money to make your car slower, while you could save money by getting an off-road y-pipe and make better power!
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08-15-2008, 09:18 PM #17
- Join Date
- Oct 2007
- Location
- Beaver Dam KY
- Posts
- 7,745
79 T/A -91 Firebird- 1998 Trans Am -Oynx Black
My DAPO of my car had the passengers go out so he just put a straight pipe in. the drivers is still there!!
my new ory will take care of that
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08-16-2008, 01:49 AM #18
- Join Date
- Mar 2008
- Location
- Manitowoc, WI
- Posts
- 7
Purple- 1998 Pontiac Trans AM
do the o2 sensors have to be specially tuned out or can any mechanic do it? i have a small amount of money to spend n i would like to get the most power. is there more than two cats on these cars. i only saw two. are there internal o2 sensors in these two cats?
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08-16-2008, 01:58 AM #19
- Join Date
- Oct 2007
- Location
- Beaver Dam KY
- Posts
- 7,745
79 T/A -91 Firebird- 1998 Trans Am -Oynx Black
Yes. They have to be tuned out using a specific program/device. There are only two cats and the worthless 02 sensors are right after the cats.
You can buy a off road ypipe for 189 bucks that removes the cats and replaced them with 3 inch exhaust. The y-pipe bolts up just like factory. Mine is laying in the garage drying after a coat of header paint.
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08-17-2008, 11:37 AM #20
$75 to tune your 02 sensors out is cheap as hell almost hard to beleaive. Where in ILL. can i get my 02's tuned out for that price?
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