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What's the most high-flow cat for a good price?

This is a discussion on What's the most high-flow cat for a good price? within the External Engine forums, part of the LSx Technical Help Section category; So I'm looking at replacing the stock cat and i need some suggestions on some high-flow cats....

  1. #1
    Junior Member 98tranny's Avatar
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    What's the most high-flow cat for a good price?

    So I'm looking at replacing the stock cat and i need some suggestions on some high-flow cats.

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    cutting and welding mark21742's Avatar
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    summit racing has Magnaflow hi-flow universal cats for around $60 each

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Here are some nice high flow cats.
    http://store.summitracing.com/partde...5&autoview=sku

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    Member QKSLVR99's Avatar
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    magnaflow

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    rapter34
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    why are you replacing your stock cats? you wont see much power gain from getting hi flow cats and if you have stock headers than that is going to be a real pain in the ass trying to get everything to fit right. If you are getting long tubes than that is a different story.

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    loreak
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    yeah magnaflow are definately the cheapest cats and they are tiny, i bought 2 for about 80 each and they are so much smaller then normal cats its unbelievable

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by loreak View Post
    yeah magnaflow are definately the cheapest cats and they are tiny, i bought 2 for about 80 each and they are so much smaller then normal cats its unbelievable
    $80?? Doesn't sound like a high flow cat at that price? You got a link?

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    Junior Member 98tranny's Avatar
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    Quote Originally Posted by rapter34 View Post
    why are you replacing your stock cats? you wont see much power gain from getting hi flow cats and if you have stock headers than that is going to be a real pain in the ass trying to get everything to fit right. If you are getting long tubes than that is a different story.
    i'm not looking to get that big of a horsepower gain, i'm just trying to get my exhaust flowing good. i'm going to start with an slp loudmouth and hi-flo cats and after that i'm saving up for the longtubes. and i dont understand why the cats wouldnt fit on right just because it has stock headers.

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    rapter34
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    becasue the stock cats have pipes coming on eaither side up th the head and down. so you would need to get it all welded and made it fit. trust me save the money wait till you are putting LT on than get a y pipe.


    first notice the conection to the headers. I don't have the view of teh cat but there is about a 6 inch tube after the cat. you are not going to get jack from high flow. the cost is not worth it.
    I mean we are talking like 3HP maybe.

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    Junior Member 98tranny's Avatar
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    Quote Originally Posted by rapter34 View Post
    becasue the stock cats have pipes coming on eaither side up th the head and down. so you would need to get it all welded and made it fit. trust me save the money wait till you are putting LT on than get a y pipe.

    Click for full size
    first notice the conection to the headers. I don't have the view of teh cat but there is about a 6 inch tube after the cat. you are not going to get jack from high flow. the cost is not worth it.
    I mean we are talking like 3HP maybe.
    so i guess the best thing to do is wait for the longtubes. could you notice a difference after longtubes?

  11. #11
    rapter34
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    yes, its does seem to rev nicer and in the uper band it really feels more powerful. couple it with an LS6 intake and you really free up the engine. LT= about 15 RWHP, LS6= about 15 RWHP (between) 4-6K on the RPM's

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    LTX N20LT4's Avatar
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    Random Technology over any other cat.

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    loreak
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    Quote Originally Posted by 9t8z28 View Post
    $80?? Doesn't sound like a high flow cat at that price? You got a link?
    Thats what the shop charged me that I got my custom exhaust done at, I havent checked what they retail for online.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by loreak View Post
    Thats what the shop charged me that I got my custom exhaust done at, I havent checked what they retail for online.
    Do you have the part# or the description?

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    Senior Member INMY01TA's Avatar
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    Stock cats flow good, no gain from aftermarket cats.

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    LTX N20LT4's Avatar
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    Quote Originally Posted by INMY01TA View Post
    Stock cats flow good, no gain from aftermarket cats.
    Your wrong on that one. I've seen too many comparo's in the past that said otherwise. Stock cats suck.

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    Crazy Canuck ! Eugenio_SS's Avatar
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    waht about gutted cats ?
    Eugenio_SS
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    LTX N20LT4's Avatar
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    Quote Originally Posted by Eugenio_SS View Post
    waht about gutted cats ?
    Gutted cats tend to make an ugly clickidy-clack sound...other than that, they are pretty much the same as a straight pipe.

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    Senior Member INMY01TA's Avatar
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    Quote Originally Posted by N20LT4 View Post
    Your wrong on that one. I've seen too many comparo's in the past that said otherwise. Stock cats suck.
    Well if an off road y pipe connected to stock manifolds gains you maybe 5 hp max, what would high flow cats gain you? Okay, we'll call it 2 1/2 hp (1.25 per cat) and call it a day. Money well spent there.
    Last edited by INMY01TA; 07-16-2008 at 07:06 AM.

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    Crazy Canuck ! Eugenio_SS's Avatar
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    Quote Originally Posted by N20LT4 View Post
    Gutted cats tend to make an ugly clickidy-clack sound...other than that, they are pretty much the same as a straight pipe.
    they do perform great... and seem to have cats so cops won't give you trouble.

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