Y-pipe for dual cats
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Junior Member
Joined: Feb 2003
Posts: 35
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From: hiding from the wife
Car: 1991 RS B4C
Engine: Stock 350
Y-pipe for dual cats
Does anyone make an aftermarket Y-pipe for a dual cat system? I checked with my car parts guy and he said that walker does not make one any more.
Supreme Member
Joined: Jan 2001
Posts: 1,609
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From: www.thirdgentech.com
Car: 2004 GTO
Engine: LS1
Transmission: T-56
I just got one from Summit the other day. It is part number FLO-16078. The cost was $46.95 and had to wait about two weeks for it.
I will get a pic of it in the next day or so.
I will get a pic of it in the next day or so.
I ordered this one, there was no backorder.

I also ordered these two parts from jcwhitney.com
81ZX2937T (2 45* pipes with 2.5" inside diameter ends)
21ZX3254N - straight section of 2.5" outside diameter pipe.
The flowmaster y-pipe/collector above has and inside diameter of 2.5" so once I get my pipe from jcwhitney it should be easy to just pop them all together.. Then I just have to take it to get it welded.
I also ordered these two parts from jcwhitney.com
81ZX2937T (2 45* pipes with 2.5" inside diameter ends)
21ZX3254N - straight section of 2.5" outside diameter pipe.
The flowmaster y-pipe/collector above has and inside diameter of 2.5" so once I get my pipe from jcwhitney it should be easy to just pop them all together.. Then I just have to take it to get it welded.
Supreme Member
Joined: Jan 2001
Posts: 1,609
Likes: 0
From: www.thirdgentech.com
Car: 2004 GTO
Engine: LS1
Transmission: T-56
It basically that collector with the two pipes extented and bent to go in to the converters smoothly.
Car Craft did a test on this part few years ago and found 10 RWHP and 8 RWTQ by swapping it for the factory tee'd "F" design.
Car Craft did a test on this part few years ago and found 10 RWHP and 8 RWTQ by swapping it for the factory tee'd "F" design.
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