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Old 09-11-2005, 01:50 AM   #1
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Join Date: May 2005
Posts: 41
Car: 87 IrocZ
Engine: 350
Transmission: 700r4

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Stock cat diameter?
Hey guys,

I just purchased hedman shortie headers and the hedman ball flange y pipe which is 2.5 inlet and 2.5 outlet. I was wondering, what am i going to have to do to keep the stock cat. its wierd, because i have the stock cat on my car, but an aftermarket exhaust. Im not really even sure what diameter that is. but it is NO DOUBT way newer than say the y pipe is.
what do you guys suggest?

yes, my cat is gutted, so i'd rather just keep it and save money haha.
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Old 09-12-2005, 12:09 PM   #2
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Location: Littleton, CO USA
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Car: 82 Berlinetta(2)/57 Bel Air
Engine: 86 LG4-> ZZ3(LS1)/mild 396
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If the 350 is the factory engine, then your cat inlet is 3".

If the 350 is not the factory engine, then we'd have to know what was.
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