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Old 07-22-2010, 02:31 PM   #1
sburck
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2011 Forester

Default Tuner told me something I never heard before about catalytic converters.....

Well I spoke to a local tuner who is highly regarded and one thing that came up was running cat's in my exhaust. He told me that the only cat's that are really worth buying are pretty much all over $500 (this is the price of the cat alone, not a catted DP). I was told most cheaper cats will not last very long, and will have an almost negligible effect because of the cheap catalysts they use. This advice makes sense, except I can barely find any cats that expensive, and all of the reputable companies that make catted DP's cant be using these $500+ cats because of the price of their DP's. Sounds a little funny to me but at the same time I know that a lot of these catalysts are rare metals.
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Old 07-22-2010, 02:34 PM   #2
lavid2002
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Is he a reputable tuner?

Why are you putting cats in your car? I took all mine out except the downpipe, I went with the ERZ catted down and it has been working great.
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Old 07-22-2010, 02:41 PM   #3
AENIMA
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i couls see a cheap cat failing before a good one, but if you live where you dont have to get smog checked, personally i would go catless
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Old 07-22-2010, 03:07 PM   #4
sburck
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thing is all of the cats I see would be considered cheap by his standards.

Reasons for my going catted:
-Don't want fire shooting out of my exhaust pipes
-Don't want black soot all over my white bumper
-Lastly unburnt fuel is really really bad for the environment, I'm not a tree hugger but i do put on maybe 12-15k miles a year and that gasoline vapors are very nasty, plus we have to tune our cars to run a bit rich under high boost which means even more unburnt fuel.
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Old 07-22-2010, 03:23 PM   #5
Cobb Tuning
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On the STI, the biggest argument for a cat, from a performance standpoint, is boost control. Catless exhaust systems, 9 time out of 10, will cause your car to boost creep. This is a mechanical condition that is very difficult or impossible to "tune out". Simply running a quality downpipe with a cat is a great way to avoid boost creep. We offer only catted downpipes because of this and to keep vehicles at least somewhat emissions compliant.

Travis
COBB Tuning
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Old 07-22-2010, 04:45 PM   #6
van_dutch
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The difference in cat price ususally comes down to materials. Palladium, platinum, and rhodium are very expensive but very good catalysts. You can get away with other materials like nickel or copper or manganese or a few others, but they aren't quite as good. In terms of emissions, a cheaper one will probably not perform as well. The decreased cost has to come from somewhere. I don't know where he is getting that $500 figure as that is a ton of money. I can't really speak to the difference in construction methods, but it is typically another place that money can be saved. So there is some sense to what he is saying.
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Old 07-22-2010, 05:11 PM   #7
ericsson
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Quote:
Originally Posted by Cobb Tuning View Post
On the STI, the biggest argument for a cat, from a performance standpoint, is boost control. Catless exhaust systems, 9 time out of 10, will cause your car to boost creep. This is a mechanical condition that is very difficult or impossible to "tune out". Simply running a quality downpipe with a cat is a great way to avoid boost creep. We offer only catted downpipes because of this and to keep vehicles at least somewhat emissions compliant.

Travis
COBB Tuning

Wouldn't an EWG eliminate boost creep?
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