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Old 09-12-2004, 21:32   #1 (permalink)
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Info on Cats...

Hey guys..

Was looking at getting a 2.5' cat back zort installed and hey asked me about the cat. Now, I have no idea about these things other than gutting them is good for the car, but not the law.

So do different cats make that big of a difference to a I6? Is the stock one good enough? $220 for a better cat seems a bit rich when the system is costing me $260 all up :/

What do you guys run?
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Old 09-12-2004, 22:24   #2 (permalink)
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Re: Info on Cats...

I've been told that the "high-flow" cats are a bit of a joke, and don't really do much - if you're running NA and haven't done any major mods (big cams etc), the restriction wont be the cat, it'll be some other part of the exhaust system.

Gutting it will allow better exhaust flow, but if you get caught I think it's a $20,000 fine or something crazy
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Old 09-12-2004, 22:35   #3 (permalink)
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Re: Info on Cats...

The standard cat flows more than enough for over 230kw.
You do however need to modifiy it, something which your local exhaust guy can do easily.

You simply need to cut the ends off, and enlarge the openings to 2.5" and then weld 2.5" flanges on, or weld straight up to the 2.5" pipe within your systm.

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Old 09-12-2004, 23:01   #4 (permalink)
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Re: Info on Cats...

This bring one question to my mind, would a hollowed out cat flow better than a high-flow cat? I'd assume so, but am not too sure.
It's up to you, gut it if you want to, but remember that it's not good for the environment or the law...
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Old 09-12-2004, 23:11   #5 (permalink)
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Re: Info on Cats...

A hollowed cat needs a 2.5" pipe stuck right through it, otherwise the shape of the cats body creates swirl of some sort, and actually slows dlow down.

Rick.
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What's that?..... Did I hear you say TQE power?
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Old 09-12-2004, 23:55   #6 (permalink)
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Re: Info on Cats...

Quote:
Originally Posted by Soxx
A hollowed cat needs a 2.5" pipe stuck right through it, otherwise the shape of the cats body creates swirl of some sort, and actually slows dlow down.

Rick.
Thats it coverd from the fluid flow side of things, is the 0.5kw gain from hollowing your cat worth the EPA/RTA/health issues.
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Old 09-12-2004, 23:59   #7 (permalink)
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Re: Info on Cats...

Quote:
Originally Posted by Walkinshaw
Thats it coverd from the fluid flow side of things, is the 0.5kw gain from hollowing your cat worth the EPA/RTA/health issues.
I ain't going near that...............

Rick.
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Old 09-13-2004, 03:48   #8 (permalink)
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Re: Info on Cats...

i run gas about 90% of the time, so i have no problem as far as the environment goes with gutting mine... but i wouldnt do it coz im not full gas, and i would get ****ed over by the cops, becuase they like to **** people over
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Old 09-13-2004, 03:52   #9 (permalink)
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Re: Info on Cats...

had hi flow cats on the merc 200 and it picked up big power and also had fitted to a friends BMW 540 and its quicker than the new ones now. even just to replace the old cat every two years u will notice a big difference in power, ask to look inside ur old one and see what small holes u are trying to make the gasses pass thru, but like farting in a wet suit 30 foot down
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Old 09-13-2004, 03:55   #10 (permalink)
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Re: Info on Cats...

Quote:
Originally Posted by dodge
had hi flow cats on the merc 200 and it picked up big power and also had fitted to a friends BMW 540 and its quicker than the new ones now. even just to replace the old cat every two years u will notice a big difference in power, ask to look inside ur old one and see what small holes u are trying to make the gasses pass thru, but like farting in a wet suit 30 foot down
lol..i know what the inside of a cat looks like...I was just wondering whether its worth the extra $220.
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FOR SALE: EA/ED |T5| |2.5' Zorts| |15' EF XR'S| |AU Thermo's| |XR cosmetics|

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