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Old 05-03-2015, 01:32 PM   #1
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Default carbon smell after remove CAT ? any idea

hello chevy ,,

i have got chevy caprice 08 ... IN US called pontiac G8

engine : LS2

i just install ( HEADERS ) /// Afe FILTER // LAST 2 MAGNAFLOW MUFFLER .160 SLP thermostate , BASIC TUNE ,

also i remove the catylics converter .

now the car in perfect condition but my major problem is the strong smell in the exhaust . not inside the car only outside , that when i want to put anything in trunk i feel the smell strong ,

there is any solution to decrease the carbon smell ?
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Old 05-03-2015, 03:27 PM   #2
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Yes, install catalytic converters.

From what I understand, the smell is worse the richer the car is running (cold start).
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Old 05-03-2015, 03:43 PM   #3
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The smell is all the time. so u advice me to put the stock cat ? Or magnaflow cat
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Old 05-03-2015, 03:50 PM   #4
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Any catalytic converter will cut or completely eliminate the smell. If you are concerned with performance, a high flow unit would likely be preferable, and better than no catalytic converter.

I have a high flow unit, and still have the smell when cold, but it goes away quickly as the car warms up.
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Old 05-03-2015, 03:52 PM   #5
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If you have dual exhaust, you will likely want 2 catalytic converters, one for each side.
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Old 05-03-2015, 03:53 PM   #6
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If only in colds ,, of course i need them .

My Q: could i put the cat now with headers ?
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Old 05-03-2015, 03:55 PM   #7
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I have the stock cat ,, but iam worry that the performance will change ,, and i need to re program again
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Old 05-03-2015, 07:51 PM   #8
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Get a high flow cat. Done.
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Old 05-04-2015, 01:26 AM   #9
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My headers are long .. I should search for direct fit ?

What about the o2 sensor ?

I just make it tune for check engine light after remove the cat
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Old 05-04-2015, 06:06 AM   #10
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No, direct fit may not work in your case. Take it to a shop that can weld one in directly.

You will need the upper O2 sensors, do not remove them, do not tune them out.
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