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Catalytic Converter?

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    Ok, so i KNOW my secondary cat is OUT. It's Rattling like a mofo and is getting on my nerves. Now my question to you folks....why would my cat be breaking apart inside ESPECIALLY since i've only had my custom midpipe for about 4 months. I cant imagine a 4 month old cat breaking up this quickly. Any suggestions on why or how? And any suggestions on what kind of CAT i should get to replace this F*Ker with?
    get a header and s-pipe
    Already have the DME header and an S pipe. The secondary cat i put into the midpipe is giving me problems at this point. It's rattling when i'm in idle, so the insides are coming loose......
    jawsidmtc wrote:
    Ok, so i KNOW my secondary cat is OUT. It's Rattling like a mofo and is getting on my nerves. Now my question to you folks....why would my cat be breaking apart inside ESPECIALLY since i've only had my custom midpipe for about 4 months. I cant imagine a 4 month old cat breaking up this quickly. Any suggestions on why or how? And any suggestions on what kind of CAT i should get to replace this F*Ker with?


    I would suggest going w/ a high-flow CAT from Magnaflow or CatCo. I plan on doing this when I have my exhaust done from the header back this summer. Are you running the stock resonator? If you are pick up a better one: Moroso Spiral Flow 18'' or better and Magnaflow sell them as well.
    CadenceScion wrote:
    jawsidmtc wrote:
    Ok, so i KNOW my secondary cat is OUT. It's Rattling like a mofo and is getting on my nerves. Now my question to you folks....why would my cat be breaking apart inside ESPECIALLY since i've only had my custom midpipe for about 4 months. I cant imagine a 4 month old cat breaking up this quickly. Any suggestions on why or how? And any suggestions on what kind of CAT i should get to replace this F*Ker with?


    I would suggest going w/ a high-flow CAT from Magnaflow or CatCo. I plan on doing this when I have my exhaust done from the header back this summer. Are you running the stock resonator? If you are pick up a better one: Moroso Spiral Flow 18'' or better and Magnaflow sell them as well.

    I have a full exhaust setup. Header - Custom mid - Greddy axelback...I'm just curious and wondering why after 4 months, the NEW Magnaflow high Flow "spun" type converter went out in my midpipe. Could i be running too RICH? Too Many Vibrations? Manufacturer defect?
    If you have an aftermarket CAT, check the heat shield that's on it. The CAT may be perfectly fine (for being only 4 months old, it better be!), but the 4 little tack welds that hold the shield on may have already rusted. If the shield is loose on a weld, just cut the other welds and take the shield off. No more rattle.
    do you need one in NY? my cats are bad and my car runs fine, i have a replacement but im just waiting til i need smog before using it
    Web wrote:
    If you have an aftermarket CAT, check the heat shield that's on it. The CAT may be perfectly fine (for being only 4 months old, it better be!), but the 4 little tack welds that hold the shield on may have already rusted. If the shield is loose on a weld, just cut the other welds and take the shield off. No more rattle.

    Unfortunately, no heat shield....it's the Magnaflow "Spun" type. Just a metal casing surrounding the ceramic material inside. I already pulled my midpipe and looked inside.....i can actually push the whole ceramic piece back and forth with a screw driver....I just can't figure why it crapped out after 4 months. I can only guess that i'm either running rich or my whole exhaust is vibrating too much and shook the material loose......but i don't think i'm running rich....cuz there's no black smog collecting on my bumper.
    tokenride04 wrote:
    do you need one in NY? my cats are bad and my car runs fine, i have a replacement but im just waiting til i need smog before using it

    No...i think it's just OBD2 testing here in LI NY. No sniffer, no visual. But i wanted one "Just in case" plus i do care about the environment somewhat and i would feel super guilty about running catless, since i have an aftermarket header too. But alas, i can't afford to replace at the moment and i can't risk replacing it just for the new one to blow again after another 4 months, so this weekend is going to consist of me gutting the cat carefully without getting any of that material stuck in the rest of the pipe......
    • Edited 1 times, last by CadenceScion on .
    According to NYS DOT/Emissions Laws, if the vehicle came w/ a CAT, its required that one is there for it to pass. Some people gut them out (HoneyComb) and they will still pass, unless they probe your exhaust then a possible failure. I myself will not gut my CAT's or go w/o one, but I will be upgrading mine to a High-Flow, I have no intentions of losing backpressure/compression or running the risk of failing an inspection. OEM CAT's are restrictive as it is, plus going w/ an aftermarket resonator will help to quiet my exhaust/rasp since I am going w/ a header and a full custom exhaust 2.25'' mandrel bent.

    If a shop wants to pass your ride even though its illegal, that fine will come back on them as well as you and they could lose their licence to inspect. Not worth it for me.
    Quote:
    Could i be running too RICH? Too Many Vibrations? Manufacturer defect?


    it happens. take it off and shake it to confirm. then replace.
    Well, if the ceramic honeycomb has broken free, then you're CAT is gone. Your best bet is to replace it or remove it all together. If you're going for a visual inspection, not sure exactly how they do them in NY and if they follow the law to the letter, but getting an open resonator would be another solution, and cheaper.
    Web wrote:
    Well, if the ceramic honeycomb has broken free, then you're CAT is gone. Your best bet is to replace it or remove it all together. If you're going for a visual inspection, not sure exactly how they do them in NY and if they follow the law to the letter, but getting an open resonator would be another solution, and cheaper.

    The cat IS def gone...and i've been doing crazy amounts of research....I think i'm gonna go with the same type of cat BUT the cat WITH the Metallic Substrate as opposed to the Ceramic Substrate.....from what i've read so far, the Metallic Substrate is alot tougher and can take a bit more abuse than the Ceramic can....so hopefully that'll reduce the possibility of having to replace it every 4 months. I'm also almost certain it was the extra vibrations coming off my header that caused this. I just recently put the header brackets back on....and the only reason i didn't have them on was because they had to be fab'd to fit right. I'm not running rich and my plugs aren't misfiring and i'm using the right gas.(other reasons why a cat would burn out)So, the only reason left would be because of vibrations.......I'm crossing my fingers and hoping this solves my problem!
    Gottcha.....metallic substrate converters are considered "high flow" too, so you should be good. They don't convert as much of the exhaust into safer fumes like the ceramic, but they have less resistance overall.
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