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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Stock Exhaust Size?

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Old May 30, 2023 | 09:27 PM
  #16  
Francis2e's Avatar
Francis2e
1st Gear
Joined: May 2023
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Originally Posted by torq'ta 5 8
that is the 2nd part of the cat system, it also has the ceramic honeycomb in it to catch more pollutants, the first one misses
What is the pipe labeled 4G
 
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Old Feb 4, 2025 | 09:02 PM
  #17  
Evan jackson's Avatar
Evan jackson
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Joined: Feb 2025
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Originally Posted by Ace2021
It's a heat shield between the downstream converter and the transmission.
I'm wondering what number 4 is in the diagram,I have an exhaust leak from there at top of pipe and need to replace it
 
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Old Feb 5, 2025 | 08:24 AM
  #18  
wwhite's Avatar
wwhite
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It is an air injection pipe, from the air pump, pumps fresh air before the cat to help the cat do its job better.
SMOG stuff.
 
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