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Help! Need cats on C5

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Old Feb 9, 2019 | 11:04 AM
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Default Help! Need cats on C5

I have C5 with Kooks LT headers, Kooks catless x-pipe with Corsa Xtreme exhaust.

I can’t get my tag because the car has no cats and can’t pass emissions.

I dont wanna spend $900 on Kooks catted xpipe. Any suggestions on High flow cats I should look into having welded on the car?
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Old Feb 9, 2019 | 11:14 AM
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Swear I just saw a Kooks catted mid section on the FS section. Otherwise buy a pair of Magnaflow or sim cats and have an exhaust shop get them in. Gonna cost you a few hundred for sure.
Edit, haha, that was you WTB, oops

Last edited by grantv; Feb 9, 2019 at 11:18 AM.
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Old Feb 9, 2019 | 11:31 AM
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Yeah I got excited when I saw that guys post for his Kooks mid with cut outs but it’s catless.

Thanks for your input.
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Old Feb 9, 2019 | 11:36 AM
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Are you just trying to pass a visual?
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Old Feb 9, 2019 | 11:41 AM
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Yes. I have a tune that will pass but they failed me on visual.

I thought about dummy cats but I don’t want them to have any reason to fail me. This is already a headache and gonna get costly quick.
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Old Feb 9, 2019 | 11:47 AM
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A lot of guys have had very good luck with the inexpensive Thunderbolt hi flow cats that you can get on Ebay. Some say they work even better than the Magnaflows.

As grant suggested though I would go that route over buying a whole new mid pipe section.

Depending on who you inspector is though they may still give you a hard time as any of the high flow cats look nothing like a factory cat.
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Old Feb 9, 2019 | 07:02 PM
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Originally Posted by Mr. Black
A lot of guys have had very good luck with the inexpensive Thunderbolt hi flow cats that you can get on Ebay. Some say they work even better than the Magnaflows.

As grant suggested though I would go that route over buying a whole new mid pipe section.

Depending on who you inspector is though they may still give you a hard time as any of the high flow cats look nothing like a factory cat.
If you buy new aftermarket they should come with paperwork indicating that they are 50 state legal. Be sure and bring it to the inspection to be safe.
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Old Feb 11, 2019 | 01:14 AM
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Not sure just how good they are or what price they are sold at, but Random Technology makes replacment catalytic converters.
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Old Feb 11, 2019 | 08:58 AM
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Originally Posted by Vetteman Jack
Not sure just how good they are or what price they are sold at, but Random Technology makes replacment catalytic converters.
Don't think they make cats anymore... might be wrong.
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Old Feb 11, 2019 | 09:19 AM
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Just buy the Kooks catted pipe, bolt it in and go. By the time you F with a welder, and likely crappy weld quality because you are trying to save a $.37, you will be miles ahead knowing you have a product you can bolt in and go.

And if you want, you can just unbolt it, keep it in the garage, and put it back on next time you need an inspection.
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Old Feb 16, 2019 | 02:40 AM
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www.jegs.com has some reasonably priced cats that you can cut out a section of pipe and slip in with band clamps. I think Flowmaster makes cheaper cats, around $50 each for 2 1/2" i.d.
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