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Old 06-05-2008, 07:13 PM   #1
SupermanX24
 
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Diameter of Exhaust?
What's the diameter of the over the axle pipe on a stock LT1 car? I just might do a custom job myself.
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Old 06-05-2008, 07:59 PM   #2
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I think it's 2.75"
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Old 06-05-2008, 11:16 PM   #3
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Factory pipe is 2-3/4 and most aftermarket cat-back are 3".
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Old 06-18-2008, 07:44 PM   #4
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2 1/2. I took the muffler off and measured. Thanks anyway guys
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Old 06-18-2008, 10:06 PM   #5
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Wow....you sure that's a factory pipe? I always heard and saw that all 4th gen v8 cars had a 2.75" factory pipe.

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Old 06-19-2008, 07:25 AM   #6
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pretty sure, the entire exhaust looks stock. I got the muffler off and measured the pipe and sure enough, 2 1/2
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Old 06-19-2008, 12:21 PM   #7
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Your car single or dual cats, Pat?
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Old 06-19-2008, 05:22 PM   #8
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Old 06-20-2008, 09:34 PM   #9
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The tailpipe outlets are 2-1/2 but the inlet should be 2-3/4 or 3". It actually necks down at the y-pipe connection too.
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