My opinion differs here. I think the 4.7L is choked all through the air
flow system. Especially the 3 cat models ('00 cali and all '01's). Steve's
research came up with the answers of more air more, air and more air to get
more performance out of the 4.7. The reason changing out the exhaust has
little effect is it's still choked up at the headers, Y-pipe and cats. Even
changing the headers won't cure this, but it helps. I bet you'll see huge
gains when replacing the final pieces of the exhaust system.
Jay W
4.7L Auto Sport+ C.C. 2wd Black
Mods Profile page at
http://www.twistedbits.net/WWWProfile/dakota/Re5X8z5la@Ix2/profile.htm
>Date: Fri, 23 Feb 2001 07:22:07 EST
>From: Y2KDakuda@aol.com
>Subject: DML: 4.7 liter performance (bad andy)
>
>HP incresses are little with exhaust on the 4.7. your looking at 4 or 5
RWHP and the headers are >only putting out 7 or 8 RWHP. Everyone that I have
talked to said that the 4.7 flows so well its >hard to get HP out of the
Exaust...
>-------------------------------------------------
>Chris Lambert
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