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Old 10-03-2011, 11:02 AM   #1
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Default High Flow cats

I want to put a true dual exhaust on my '00 T/A, but I can't get around this states emissions. How much power, if any, can I expect to lose with high-flow cats vs no cats at all? Can that be negated with cutouts before the cats? And can anyone recommend a good brand or model of high-flow cat? I'm looking at slp and magnaflow but I just don't know enough about cats to make an informed decision.
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Old 10-03-2011, 02:38 PM   #2
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I had a buddy just add cats to his custom built y-pipe and he dynoed 3 rwhp less than when he had just a ORY. Not much power loss and his exhaust smell is much improved.
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Old 10-03-2011, 03:22 PM   #3
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cats will rob 2-4 hp but that is hardly noticeable. I would recommend cherry bomb cats, I picked up both of mine for $55 each brand new.
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Old 10-03-2011, 03:25 PM   #4
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I had a buddy just add cats to his custom built y-pipe and he dynoed 3 rwhp less than when he had just a ORY. Not much power loss and his exhaust smell is much improved.
How did it effect the sound of his car when he did that?
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Old 10-03-2011, 03:27 PM   #5
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^ i can answer that in a universal sense it will quiet the car a little and the cats will help with getting rid of rasp.
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Old 10-04-2011, 09:09 PM   #6
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having the same exhaust on 2 cars, the cats make it much quieter around idle and SMOOTHER throughout the RPM range. An ORY can make an angry, hammer on metal noise without a muffler.

NO smell with hi-flow cats, as well. My ORY stinks now, I have been pondering replacing it, if I didn't love the volume so much.
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Old 10-04-2011, 09:26 PM   #7
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i recently had my cats gutted on my H/C/I setup and gained around 7/7 after a tune.


high flows dont rob enough power to be concerned with and i enjoy a race gas type of smell.
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Old 10-08-2011, 11:46 PM   #8
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for passing the visual inspection get these and u wont lose anything lol

http://www.frozenboost.com/product_i...22c1e18513b06b
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Old 10-09-2011, 12:39 AM   #9
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for passing the visual inspection get these and u wont lose anything lol

http://www.frozenboost.com/product_i...22c1e18513b06b
If you live in Commiefornia those are the Cats for you!
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Old 10-09-2011, 11:59 AM   #10
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I wish it was just visual. I would just have a set of gutted cats. Unfortunately in North Carolina they use the sniffer deal. :sad:
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Old 10-09-2011, 12:22 PM   #11
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ahh ok, just curious though, if u took ur egr off and air system off and had stock cats would u fail the sniffer test? and wouldnt high flows fail sniffer too with these cars? idk just wonderin
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Old 10-10-2011, 10:45 AM   #12
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ahh ok, just curious though, if u took ur egr off and air system off and had stock cats would u fail the sniffer test? and wouldnt high flows fail sniffer too with these cars? idk just wonderin
I honestly have no clue. This is my first time getting an emissions on one of these
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Old 10-10-2011, 08:51 PM   #13
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I wish it was just visual. I would just have a set of gutted cats. Unfortunately in North Carolina they use the sniffer deal. :sad:


No they don't.They do a visual for cats, egr and air and plug in to your odb II port and check the pcm for codes. I know because I live in NC too. You will have to get cat delete on pcm though....
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