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Old March 29th, 2011, 7:10 pm   #1
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Default Impact of removing catalytic converter

So i heard from a friend of mine that if i remove my catalytic converter i will increase my engine performance and mpg. Now i dont care for speed but i do care for mpg.
Will it be noticeable? ohh and i dont care if the car is loud considering the Harleys i hear driving by practically shacking my windows.
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Old March 29th, 2011, 7:16 pm   #2
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In theory, anytime you reduce or eliminate a restriction to the flow of exhaust you should increase engine performance and mpg. However, I think it's illegal to remove a cat.

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Old March 29th, 2011, 7:19 pm   #3
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yes this is true, you'll get more performance (ie hp), and slightly more mpg, espcially if you open up all your exhaust with a free-flowing cat-back system

it might be a touch noisier.....replace the cat with a resonated test pipe...you can get good quality ones on ebay for around $75 or less (you'll need a 17" long one)

then you can sell your catalytic converter on ebay for scrap for $150

your emmissions will go up though, if you are worried about the environment id suggest gettign a Magnaflow hi-flow catalytic converter to replace your OEM one....then you'll still get the performance and mpg gains and still maintain emmissions
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Old March 29th, 2011, 7:20 pm   #4
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how easy is it to tell? i have head of people running a pipe threw the thing to make it look like it there but its been opened up.
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Old March 29th, 2011, 7:29 pm   #5
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you could gut the cat. and put it back on empty inside, this way the law wont say you have no Cat. ..i dunno about emission test.

Also i am in doubt of the fact that by removing the cat..you will drop exhust backpressure..leading to a bad reading of the O2 sensor.( let s say the exhaust flows so rapidly, the O2 does not have time to measure properly).

you my get noticeable less top speed, and i dunno about mpg
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Old March 29th, 2011, 7:31 pm   #6
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ive done some reading and it seems some say it will some say its a horrible thing to due to your engine.
i was hoping someone could tell me if it will improve mpg top end i do not care about.
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Old March 29th, 2011, 7:34 pm   #7
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Should not effect the O2 sensor as it is just sitting there switching back and forth between rich & lean signals as the exhaust gas flows by.
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Old March 29th, 2011, 8:13 pm   #8
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it wont harm anything, on OBDII vehicles you might get a check engine light as they have an O2 sensor downstream of the cat, but for first gen probes it wont affect anything but will give you more horsepower and milage, top speed wont be affected unless you have a GT....then you'll just get there faster lol

just hacking out your cat on a stock exhaust system isnt really worth it though....you might as well upgrade your whole exhaust to a catback system....then you'll really notice the power and mpg increases
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Old March 29th, 2011, 8:39 pm   #9
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well i am looking to get the most bang for the least amount of money in this case its just take of part replace with pipe and im should be good.
If i get some spare cash i might pick up a new system.
Links to a cat back system? someone in the mid MI area got one for sale maybe?

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Old March 29th, 2011, 9:23 pm   #10
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just ditch it i havent had cats in really any of my cars.... cats are for tree huggers
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Old March 29th, 2011, 10:02 pm   #11
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Very well put.
Should i gut it or just remove it?
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Old March 29th, 2011, 11:19 pm   #12
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If you have inspections, gut it. If you have emissions testing, replace it with a high flow cat. If you have neither remove it.
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Old March 29th, 2011, 11:34 pm   #13
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exactly. where do you live? and do you have to worry about emissions and/or inspections
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Old March 30th, 2011, 12:37 am   #14
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i live in MI
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Old March 30th, 2011, 1:39 am   #15
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the increased flow will increase hp which will hurt mpg. high flow and universal cats are dirt cheap these days.
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