Using the search function/link failed me....
Thread Starter
Member
Joined: Sep 2011
Posts: 80
Likes: 3
From: High Desert, CA
Using the search function/link failed me....
The search failed me or I didn't read between all the lines, but after 3 weeks of looking, I am looking for the desired size for exhaust tubing to run on a 2001 4.6 supercrew... I'm looking towards the 3", but will the truck fall on its face for running too big of tubing? I plan on getting a borla 3" in/3" out and from the cat back. I have a K&N 77 series CAI thats ready to be installed as well. Will 3" be sufficient or too small or too big?
Thanks in advance...
Thanks in advance...
Seņor Member
Joined: Dec 2009
Posts: 486
Likes: 19
From: Arizona
Here ya go:
https://www.f150forum.com/f6/exhaust...ze-help-20600/
Specifically, from "Green '01"
So, go with 2.5" and get an X-Pipe.
https://www.f150forum.com/f6/exhaust...ze-help-20600/
Specifically, from "Green '01"
I remember reading that a dual 2-1/2" system with same sized cross-pipe after the cats will handle up to 400 horsepower...an improvement over 2-1/4" pipes even on stock engines. Larger than 2-1/2" with less than 400 horsepower will just hurt performance. Will cause a loss in HP and Tq.
In any case, a cross pipe of same diameter on true dual systems will help bottom end torque. An "X" pipe after cats improves scavenging and can improve performance over a straight cross-pipe, but the "X" will give more of a raspy NASCAR sound and the straight will generally give a deeper tone, which I personally prefer. Good luck.
In any case, a cross pipe of same diameter on true dual systems will help bottom end torque. An "X" pipe after cats improves scavenging and can improve performance over a straight cross-pipe, but the "X" will give more of a raspy NASCAR sound and the straight will generally give a deeper tone, which I personally prefer. Good luck.
Thread Starter
Member
Joined: Sep 2011
Posts: 80
Likes: 3
From: High Desert, CA
I might go that route, I was hoping to just go with a single pipe all the way back, but it sounds like the dual is what everyone is using... Do muffler shops stock these "X" pipes? or do they have to be specially ordered? I would like to run just a single muffler and tubing from cat-back if possible to get a little gain.... Thanks.
Last edited by VMBMX79; Jul 6, 2012 at 01:26 AM.