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3rd & 4th Generation (1992–1996 & 1997–2001) Toyota Camry Discussion for years: 1992-1996 & 1997-2001 Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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Old 01-25-2008, 01:39 PM   #1 (permalink)
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4th Generation Catalytic converter on or off?

When I am getting the exhaust work done aka headers and new muffler. Should i keep the catalytic converter off? Would i gain any extra hp with it being gone?
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Old 01-25-2008, 03:09 PM   #2 (permalink)
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Doesn't anyone or does everyone just keep it on? I am just curious because a friend of mine told me too and i wanted a second opinion on whether it would matter
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Old 01-25-2008, 05:30 PM   #3 (permalink)
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Off = Harm to environment, failing emissions test, CEL, and slightly faster/louder
On =

You can get a high-flo cat, that'll still act better then a straight pipe.
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Old 01-25-2008, 05:40 PM   #4 (permalink)
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High flow cat FTW
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Old 01-25-2008, 06:48 PM   #5 (permalink)
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Do not mess with Cat. CEL will drive you crazy.

It took me one month to find the right after market cat. for my ES300.
Hope that helps.
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Old 01-25-2008, 09:08 PM   #6 (permalink)
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Old 01-25-2008, 09:29 PM   #7 (permalink)
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like other members say just get the high flow cat. it will save you some money and time, too.
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Old 01-25-2008, 10:51 PM   #8 (permalink)
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highflow FTW, often they are even better then the stock ones when it comes to emissions since to be 50 state legal they have to work in cali.
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Old 01-25-2008, 10:53 PM   #9 (permalink)
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Cali FTL...
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Old 01-25-2008, 11:15 PM   #10 (permalink)
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Removing or spending money on an after market cat will do nothing for a 5s-fe, maybe 5 horsepower and it is bad for the environment. Really, you are not going to make a noticeable difference in horsepower removing it so you might as well keep it on.
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Old 01-25-2008, 11:35 PM   #11 (permalink)
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none of it is gonna really help. but the cat is one of the few places on the 5sfe where u can pick up some power up top. highflow cat is better then no cat, wouldnt u agree? however the exhaust may become a little more raspy and ull loose some back pressure which may cause a small loss in low end power.

honestly, id only screw with the cat if u have the money and are thinking of going further with the car then just adding a few exhaust components. if u did a larger catback for example ud want a higher flow cat to make the cost of that catback actually worth it. other then that its a waste of money IMO.
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