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Cammed LS3, Which Hi-Flo Cat?

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Old Sep 17, 2020 | 11:51 PM
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Default Cammed LS3, Which Hi-Flo Cat?

Need a 3" Hi Flow Catalytic Converter. The one the exhaust shop installed is overheating and causing back pressure. I'm in cahoots with them right now but basically I need to have a replacement plan. It still needs the honey comb and to function as a cat or I won't beable to get it installed by an exhaust shop. Any idea?
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Old Sep 18, 2020 | 12:17 AM
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Stainless Works
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Old Sep 21, 2020 | 09:14 AM
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Do they sniff test?
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Old Sep 21, 2020 | 05:05 PM
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The one that has nothing in it. I found they usually work the best.
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Old Sep 24, 2020 | 08:12 PM
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Dynatech
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Old Sep 25, 2020 | 11:01 AM
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Originally Posted by Need4Camaro
Need a 3" Hi Flow Catalytic Converter.....
I used a MagnaFlow universal cat.

#59959

KW
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Old Sep 25, 2020 | 01:18 PM
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Originally Posted by joyridin'
The one that has nothing in it. I found they usually work the best.
No issues with those. LOL.
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Old Oct 2, 2020 | 05:12 AM
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Originally Posted by joyridin'
The one that has nothing in it. I found they usually work the best.
Which ones are those?

Originally Posted by Bspeck82
Do they sniff test?
Not 100% sure, never did an emissions test here before. Where it is currently registered, out of state, it doesn't require emissions, but here I do if I ever needed to register it here.

Kind of want to keep cats on it incase I ever need a sniffer done but the ones that are on there are overheating and also causing my motor to overheat. They appear to be random 3" Bullet Cats, but cant tell what brand they are. One shop commented that they are not true high flow cats but I believe he stated that because they are not gutted.

It's putting down 425 RWHP so I'd imagine with all the drivetrain loss (Stalled and built A4) its making pretty close to 500 at the crank.

Last edited by Need4Camaro; Oct 2, 2020 at 05:52 AM.
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Old Oct 2, 2020 | 06:45 AM
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Originally Posted by Need4Camaro
Which ones are those?
Those are the ones where you take off the cats that are on there now, get a long screwdriver and a hammer and empty the insides, then reinstall them. Depending on your set-up, you can disable the secondary O2 sensors and tune the car to run on the front O2 sensors before the cats.

The state I live in has Collector Plates for new cars that allow you to bypass emissions testing. You have to have receipts for $5k in upgrades and have another car you drive daily. If it is older than 25 years, you can get Historical Vehicle plates, but you can only drive it to shows, parades, and other related functions. As long as you are not driving it to work or driving daily, they usually do not pay a lot of attention.
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Old Oct 2, 2020 | 06:59 AM
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Originally Posted by joyridin'
Those are the ones where you take off the cats that are on there now, get a long screwdriver and a hammer and empty the insides, then reinstall them. Depending on your set-up, you can disable the secondary O2 sensors and tune the car to run on the front O2 sensors before the cats.

The state I live in has Collector Plates for new cars that allow you to bypass emissions testing. You have to have receipts for $5k in upgrades and have another car you drive daily. If it is older than 25 years, you can get Historical Vehicle plates, but you can only drive it to shows, parades, and other related functions. As long as you are not driving it to work or driving daily, they usually do not pay a lot of attention.
Which vendor makes them and where can I get them?
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Old Oct 2, 2020 | 10:53 AM
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Originally Posted by Need4Camaro
Which vendor makes them and where can I get them?
Makes WHAT?? He only mentioned destroying the innards of stock converters that you likely already have.
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