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How Big Is A Stock Y-Pipe?

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Old Jul 25, 2002 | 11:43 AM
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91-Z
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From: Jackson, MS
How Big Is A Stock Y-Pipe?
What is the diameter of a stock y-pipe on a 91 Z28 with a 350?

Thanks

Paul
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Old Jul 25, 2002 | 12:00 PM
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IROCET
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From: Columbus, Ohio, USA
Car: 88 IROC-Z (Sold)
Engine: 5.7L
Transmission: 700R4
I don't know about on a 91, but my 88 had a 3" on it. It narrowed down to the 2.5" before the Cat though.

Matt
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Old Jul 25, 2002 | 12:40 PM
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iroc22
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From: Surrey, BC
It should be 2 1/2" pipes to a 3" cat.
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Old Jul 25, 2002 | 01:02 PM
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CraZ-28
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From: Tucson, AZ
Car: 1991 Z-28
Engine: Can you say stroke?!?!
Transmission: 700-r4
Axle/Gears: 3.42
Or....it will be 2 1/2 into each cat. That is of course if you have dual cats.
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Old Jul 25, 2002 | 01:42 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I'd believe "...2-1/4" into each cat...".
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Old Jul 25, 2002 | 04:12 PM
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iroc22
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From: Surrey, BC
I know for sure the N10 dual cat is 2 1/4 piping with dual 2 1/4 cats.
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Old Jul 25, 2002 | 04:53 PM
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92BLKL98
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From: Powder Springs, Georgia, USA
Car: 1992 Black Z28 Hardtop
Axle/Gears: 2002 10 bolt w/3:23
The other day while working on my Z I measured the intermediate pipe and it measures 2 3/4" not 3" as I thought. This is on a dual cat car. Considering the total area of the two 2 1/4" cat pipes vs the total area of the after cat intermediate 2 3/4" pipe looks like the good folks at GM built a more restrictive exhaust than I realized. Definitely time for an upgrade.
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Old Jul 26, 2002 | 08:02 AM
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gmgod
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From: Springfield, MO
Car: 92 T/A VERT
Engine: LB9
Transmission: AUTO
Axle/Gears: 7.5 / 3.42's
Yeah, I just hacked up my stock exhaust and measured it. It was 2 3/4 on a 87 L98 car.
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