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High flow cats

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Old Dec 6, 2016 | 07:28 AM
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Default High flow cats
Does anyone know of a company that makes high flow cats the stock exhaust on a c5z ?
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Old Dec 6, 2016 | 09:13 AM
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I believe Random Technologies makes them - you cut the old ones out and weld the new ones in. Not sure if you have to do anything else though. Someone else that may have switched to them can answer that.
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Old Dec 6, 2016 | 09:47 AM
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Are you looking for the OEM or a replacement? Replacement I used MagnaFlow.
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Old Dec 6, 2016 | 01:26 PM
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Basically the stock oem cats are hi flow type, it was the early 70-80's cats that were more restrictive.
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Old Dec 6, 2016 | 06:57 PM
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Originally Posted by Gordy M
Basically the stock oem cats are hi flow type, it was the early 70-80's cats that were more restrictive.
This is so true. The cats back in 'the day' were crap, and horribly restrictive. Today, they're really pretty good.
I'd say if your car is stock, there's no real reason not to use OEM replacements. On the other hand, if you're putting on headers and all the rest, it's worth the cost of upgrading the cats, too. I used Random Technologies cats. They do flow a little better, and on a modified car, the little things add up.
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Old Dec 6, 2016 | 07:12 PM
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Originally Posted by Gordy M
Basically the stock oem cats are hi flow type, it was the early 70-80's cats that were more restrictive.
Good point. I assume his cats were removed, or are no good. One of mine was discolored at 45K when I was installing headers, so I dropped MagnaFlow units in.
OP, why are you wanting to replace them?
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Old Dec 6, 2016 | 10:10 PM
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Originally Posted by grantv
Good point. I assume his cats were removed, or are no good. One of mine was discolored at 45K when I was installing headers, so I dropped MagnaFlow units in.
OP, why are you wanting to replace them?
Thanks I was looking increase the hp with mods & a tune all while sticking with the original exhaust to keep the dd drivability
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Old Dec 6, 2016 | 10:11 PM
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Originally Posted by Vetteman Jack
I believe Random Technologies makes them - you cut the old ones out and weld the new ones in. Not sure if you have to do anything else though. Someone else that may have switched to them can answer that.
Thanks vetteman I looked into them & seems they went out of business
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Old Dec 7, 2016 | 12:50 AM
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Originally Posted by TripleBlackZ06
Thanks I was looking increase the hp with mods & a tune all while sticking with the original exhaust to keep the dd drivability
Removing cats entirely gain is about 5HP? If your factory cats are healthy the gain would be minimal I'm thinking.
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Old Dec 7, 2016 | 09:10 AM
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Originally Posted by TripleBlackZ06
Thanks vetteman I looked into them & seems they went out of business
You can also try Kooks or LG for the high flow metal matrix converters. Not sure if they list them separately on their websites but they use them on their exhaust systems.
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Old Dec 7, 2016 | 01:19 PM
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Originally Posted by TripleBlackZ06
Thanks vetteman I looked into them & seems they went out of business
Maybe this is why.....


Originally Posted by Gordy M
Basically the stock OEM cats are hi flow type, it was the early 70-80's cats that were more restrictive.
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Old Dec 7, 2016 | 05:39 PM
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Originally Posted by grantv
Removing cats entirely gain is about 5HP? If your factory cats are healthy the gain would be minimal I'm thinking.
I've seen a few tests that showed a power LOSS when going catless.
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Old Dec 7, 2016 | 10:03 PM
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Originally Posted by Dirty Dog
I've seen a few tests that showed a power LOSS when going catless.
So it seems like the general consensus says to leave them be so that is what I'll do , thanks for all the feedback everyone...
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