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Hi Flow Catalytic Converters Question?

This is a discussion on Hi Flow Catalytic Converters Question? within the External Engine forums, part of the LSx Technical Help Section category; My regular catalytic converters are going bad, so my question is are the Hi Flow Catalytic Converters worth the money? ...

  1. #1
    Member mglangley21's Avatar
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    Hi Flow Catalytic Converters Question?

    My regular catalytic converters are going bad, so my question is are the Hi Flow Catalytic Converters worth the money? and anything else u can add about these( gas, sound, performance) please let me know! thanks

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    I've installed Magnaflow cat-back systems on both my TA's (1995 convertible and 2000 WS6) with the Magnaflow high-flow catalytic converters even though catalytic converters are not required in Alberta, Canada. I added the high-flow catalytic converter to mainly reduce the emissions smell on vehicle start-up (wife and kids complained too much...). The sound still sounds great. From what I had read, they do help with flow but I don't think it was anything great.
    2000 WS6 Trans Am
    1995 Trans Am convertible

  3. #3
    Grand Imperial Wizard Sarge's Avatar
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    Retired Outlaw Sum Bitch

    I did the broom handle mod. Paid big bucks for the Random Technology cats and those POS didnt last 8 months......

  4. #4
    Senior Member 35thAnniZ28's Avatar
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    whats the broom handle mod?!?...as in bashing the fuck out of the stock honey comb inside the cat?

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    Senior Member JonB's Avatar
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    Quote Originally Posted by 35thAnniZ28 View Post
    whats the broom handle mod?!?...as in bashing the fuck out of the stock honey comb inside the cat?
    I'm pretty sure thats what he means, thats how I did it on my 88 monte ss. Today I would't recomend it just remove them and put some pipe in its place and sell your cats for $130. There's a guy buying them up in the wanted parts section, there worth some money and he's legit I sold mine to him a few months ago.

    As to the topic I run the magna flow/carsound hi flow cats on my setup and so far so good had them on for about a year with no problems. I could't tell you if I lost or gained any hp since I did headers, cats, y-pipe and tune all at the same time. If you have to run cats for emission generally aftermarket hi-flows are cheaper. I also believe there is a 8 year warranty on the stockers which if you have an 02 they are still covered if anything is or does go wrong with them.
    Last edited by JonB; 09-10-2007 at 09:19 PM.
    05 PBM GTO
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    Sold 01 z28

  6. #6
    Genital Salesmen WEZONIT's Avatar
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    I use the Magnaflow High Flow cats. I have had 0 problems. I did LT's, Y-Pipe and tune at the same time so I couldn't tell if there was any change from just the Y-Pipe.

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    I wish I had the link. Several test done on high flow cats vs stockers - no improvement. It appears modern converters are very efficient as they come on the car. Since I have no proof, take it for what it's worth.

  8. #8
    Senior Member 35thAnniZ28's Avatar
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    they made a test with S.a.m

  9. #9
    Senior Member JonB's Avatar
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    Quote Originally Posted by 01Z28M6 View Post
    I wish I had the link. Several test done on high flow cats vs stockers - no improvement. It appears modern converters are very efficient as they come on the car. Since I have no proof, take it for what it's worth.
    Not sure what link your looking for but I have a link that says the exact opposite.

    http://www.installuniversity.com/ins...n11.122001.htm

  10. #10
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    The test I "thought" to have seen were done on a dyno - no flow bench numbers. When hp goes up then flow volume is important but nobody I know of puts cats on a 600 hp car. For example, gutting cats should put flow bench numbers through the roof but I have yet to see someone post great results from doing it. I guess that is my feelble point. Like I said, take it with a grain of salt. I wouldn't bother with hi-flowing cats unless it saves money.
    Last edited by 01Z28M6; 09-17-2007 at 10:22 PM.

  11. #11
    Senior Member SeVeReDiStOrTiOn's Avatar
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    I had Random-Tech Y-pipe w/high flow cats....fit was really good and never had a prob with them.

  12. #12
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    there is an 8 year 80,000 mile factory warrenty on the stock cats. i had to have both mine replaced about a year after i got the car.

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