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Catalytic converter replacement for 2.5inch exhaust 

 

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 Post subject: Catalytic converter replacement for 2.5inch exhaust
Posted: Thu Feb 07, 2008 3:06 pm 
Getting Side Ways
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Gday everyone, i need a replacement cat for the car i have just bought, i believe its a cat-back exhaust where pacemaker headers are used, then the cat is short (no bends) and the exhaust continues from there..

I was wondering if anyone knows what i need and where i can get a cheap one from, secondhand preferably :)

Thanks in advance
Matt

 

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Posted: Thu Feb 07, 2008 9:40 pm 
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You could go to the wreckers and buy a cat off a late series AU falcon with low km's on it. probably $50, then take it too an exhaust shop and they can cut the 2.25in pipe at either end and weld in 2.5in flanges.

 

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Posted: Fri Feb 08, 2008 12:40 am 
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Thanks mate, i knew someone here would have the answer!
Matt

 

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Posted: Thu Feb 14, 2008 8:05 am 
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Is it worth the effort?
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Posted: Thu Feb 14, 2008 7:49 pm 
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Yeah definately, the 2.5 inch high flow cats are worth around $300 new :)

 

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Posted: Fri Feb 15, 2008 1:19 am 
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Not true... I just bought a 3 inch magnaflow cat off ebay for 130...

I looked up the stamped numbers and its definitely a genuine magnaflow..

huge thing, very well made and you can see faint light though the honeycomb when you hold it up..

I could have specified 2.5 inch for the same price, but my genie headers terminate at a 3 inch pipe.. I figured I'd sleeve 3 inches from the strags into my cat.. and sleeve the cat down to 2.5 to connect to the 2.5 cat back exhaust.

can't wait to see how it goes when I'm done with that as I think my 17yo factory cat is clagged and restrictive. (not to mention the factory headers)

rgds

Frank
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Posted: Fri Feb 15, 2008 3:20 pm 
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if your engine is stock its probably not worth the money to use one of the more expensive high-flow cats. a good option might be to use one from a v8 falcon or commodore - people always get them taken off at exhaust shops but they flow well enough for an i6.
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Posted: Fri Feb 15, 2008 5:09 pm 
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yup, that is true.. but from everything I read.. a cat is really only good for 100-150,000 before it starts breaking down, less if your car runs rich or burns oil etc...

I figured that my old EA had done 250,000 before I changed out the engine, so the cat was knackered.. I also reached that answer because even with a brand new 2.5 inch exhaust with straight though muffler, the exhaust flow seemed restricted..

I plan to do what I can go get the cat and extractors installed on the weekened, so will know soon enough.

My engine is factory except for XR6 cam and airbox (and soon to be strags).

rgds

Frank
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Posted: Fri Feb 15, 2008 6:19 pm 
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yeah i was talking exhaust shop prices. Ebay is so great for parts hey?

 

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it can be reliable and cheap,but it wont be fast
or you can be fast and reliable,but it wont be cheap

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Posted: Sat Feb 16, 2008 8:44 am 
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Hey would like to know is it better to put the cat further back (around the drivers door) & why ?

 

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Posted: Sat Feb 16, 2008 11:52 am 
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not really.


they are required to be hot to work correctly. closer to engine hotter it will be

 

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Posted: Sat Feb 16, 2008 12:33 pm 
Tyre Shredder
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Then why is jmm race exhaust system cat is back
at the drivers door. I rang jmm & asked them why there reply was that they get a few kw more but did not tell me why.

 

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FORD EL 4.0L. Crow cam, T.I Performance J3 Chip, Vernier cam gear, CMS stage 3 head, 68mm TB, AU head gasket + ARP studs, AU injectors, Pacey 4480, High flow cat, Shift kit, Stallie, 3:73 TrueTrac.

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Posted: Sat Feb 16, 2008 1:35 pm 
Tyre Shredder
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Also they told me if i perchase the complete system just put it on & enjoy. The system is years of tuning & dynoing.

 

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FORD EL 4.0L. Crow cam, T.I Performance J3 Chip, Vernier cam gear, CMS stage 3 head, 68mm TB, AU head gasket + ARP studs, AU injectors, Pacey 4480, High flow cat, Shift kit, Stallie, 3:73 TrueTrac.

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 Post subject: I wouldnt waste my money
Posted: Sat Feb 16, 2008 1:47 pm 
Parts Gopher
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Just pull the cat out, and use a jack pole to bash the core out. You will never have to replace it and its free. Not too good for emissions but there are very few emission testers around. This is by far the cheapest option if you dont mind a little hollow sound in the exhaust and dont mind bending the law a little.
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Posted: Sat Feb 16, 2008 2:52 pm 
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I await your post when you get done for no cat, and have to suddenly come up with 10k to pay the fine.....

 

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