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Old 04-12-2011, 06:46 PM   #1
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True or false

Someone from advance auto told me a v6 should not have cattless exhaust... Is this true?
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Old 04-12-2011, 06:54 PM   #2
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Re: True or false

If your talking factory it should have cats on it.
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Old 04-12-2011, 07:22 PM   #3
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Re: True or false

It's not anything that will hurt the engine necessarily. I prefer cats on a V6.

You will notice a drop in low-end power with the removal of cats.
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Old 04-12-2011, 07:31 PM   #4
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Drop on low in power?
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Old 04-12-2011, 07:31 PM   #5
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Doesn't cattles improve hp and mpg
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Old 04-12-2011, 07:34 PM   #6
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Quote:
Originally Posted by MC770
If your talking factory it should have cats on it.
Aftermarket
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Old 04-12-2011, 08:24 PM   #7
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Re: True or false

If you remove your cats you will gain a CEL. The only way to get rid of that is by using something like an x-cal, MIL eliminators, or a dyno shop. The "gains" are negligible and unless you are running something like a turbo, you don't want to hear your v6 without cats.

*Gains is in quotes because all you are doing is moving hp from the low rpm band to the high rpm band.
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Old 04-12-2011, 08:27 PM   #8
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Re: True or false

Quote:
Originally Posted by Blackedout View Post
Doesn't cattles improve hp and mpg
Actually, catalytic converters are HIGHLY efficient nowadays. Leaps and bounds over what they were in the 70's, 80's, and even early 90's. I believe a few studies were done, unofficially, on our cars that proved you actually lose mpg by removing your cats because of the 3.8's need for that additional backpressure at city speeds.
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Old 04-12-2011, 08:34 PM   #9
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I have a tuner for my cel. And u think I should buy a catted x pipe ?
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Old 04-12-2011, 08:51 PM   #10
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Re: True or false

Quote:
Originally Posted by Blackedout View Post
I have a tuner for my cel. And u think I should buy a catted x pipe ?
If you can live with the 4 stock cats I'd suggest keeping them and have the stock y-pipe removed to 2 divorced pipes.

If you want aftermarket hi-flow cats then a catted midpipe is a good option, but it is more expensive.
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Old 04-14-2011, 01:34 AM   #11
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Re: True or false

You need to remember how important keeping the proper back pressure is to the engine. Gradual increases help in scavenging exhaust gases out too. Superchargers and turbos are the exception, they require a full 2.5" exhaust.
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Old 04-14-2011, 08:28 AM   #12
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Re: True or false

True (due to it will not sound good)
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