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Old May 12th, 2015, 05:44 PM   #1
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Cat converter

So I just had my PCD's and my cat back installed, and it is awesome, but my rear cat is rusted and about to be done soon. The exhaust I bought, the guy removed the magnaflow resonator and put a high flow cat in its place so the exhaust will still have a cat on it, if I use a test pipe, or something. I just cant find one. I searched ebay and found one but it looked cheap as hell and was only like 30 or 40 bucks so im sure it would sound like a tin can. I cant get a J pipe yet so I was wondering if anyone had any ideas where to get the flanges, so I could make my own pipe, or if anyone knows where to get a decent straight pipe, or at this point id hollow out a decent cat housing... Any input is appreciated.

Just cant afford a Jpipe right now, have to replace tie rod ends and get an alignment, and I have to focus on another vehicle that has issues....

Thanks
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Old May 13th, 2015, 01:35 PM   #2
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Quote:
Originally Posted by hightechredneck View Post
So I just had my PCD's and my cat back installed, and it is awesome, but my rear cat is rusted and about to be done soon. The exhaust I bought, the guy removed the magnaflow resonator and put a high flow cat in its place so the exhaust will still have a cat on it, if I use a test pipe, or something. I just cant find one. I searched ebay and found one but it looked cheap as hell and was only like 30 or 40 bucks so im sure it would sound like a tin can. I cant get a J pipe yet so I was wondering if anyone had any ideas where to get the flanges, so I could make my own pipe, or if anyone knows where to get a decent straight pipe, or at this point id hollow out a decent cat housing... Any input is appreciated.

Just cant afford a Jpipe right now, have to replace tie rod ends and get an alignment, and I have to focus on another vehicle that has issues....

Thanks
IIRC I used a flange from a 2.5" exhaust that was used as an american standard or something.

If you have a 3" tube you can use vibrant flanges. If you're using anything smaller it'd be an easier find and better to just use the front flange off your cat, have somebody bore it out to diameter and clean it off, and extend your catback up to the j-pipe.

DON'T use the 2.5" flange from vibrant, their online published numbers about diameters and bolt diameters are incorrect.
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Old May 13th, 2015, 03:10 PM   #3
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My cat flanges are rusted, about shot. I was thinking about finding someone with a used cat in better shape than mine and just hollowing it. Just have to save up for the J Pipe. I thought it deleted the rear cat.. am I wrong?
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Old May 13th, 2015, 03:49 PM   #4
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stock cats are something like 1.75" in diameter, not much airflow hollowing it out if you put anything bigger than that behind it.

Plus if your flange is rusted out, and you did even a 2" exhaust, thats still 1/4" to bore out of the flange, belt sand the rust off of everywhere else(the flange is like 3/8 thick, you have space) and reuse.

Used cats are expensive stock. compared to that solution.

Edit: there are some pipes that delete the 3rd cat, that would be a solution as well. Or have a j pipe made if your friend is skilled and you have time.
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