Bill, the factory manifolds flow very well as-cast. Ask Paul, the guy who
put the Borla headers on his KB SC'ed 4.7 4x4. I think he was pretty
dissapointed with the gains that the headers gave him. I think you're onto
something with the cats, but a more traditional setup would be to hollow the
2 y-pipe cats and then get a high-flow for the #3. Then build you a cat-back
from there.HTH,
Will Coughlin willcoughlin@hotmail.com
'00 reg.cab,2wd,4.7L/NV-3500HD5-spd/3.92sg(9.25")
http://www.geocities.com/willcoughlin/index.html
----Original Message Follows----
From: "Thumper" <thumper72@lvcm.com>
Just thinking out loud...bear with me. Tell me if I got this right.
1. The 2001 4.7 has 3 cats on it...1 on each side of the Y-pipe and one
towards the end of the Y-pipe?
2. The 4.7 stock exhaust manifolds are, as of now, just as good if not
better as headers as far as performance gains are concerned?
Correct me if I am wrong but wouldn't putting high flow cats on both sides
of the Y-pipe, hollowing out the cat at the end of the y-pipe, and getting a
high flowing muffler be an ideal setup for the 4.7 without losing too much
low-end? It seems to me that the flow is being lost through the cats, not
necessarily the exhaust manifolds and pipes.
TIA
Bill Boggs
ICQ# 96440831
thumper72@lvcm.com
http://www.lvcm.com/thumper/white_lightning.html
"White Lightning"
2001 CC 2WD Sport+ 4.7 Auto
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