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Diy Intake Question

1K views 3 replies 4 participants last post by  scagle1 
#1 ·
So i did the Napa 6637 mod and instead of doing a 4" to 4" coupler i did a 4" from the filter to a 3" to the intake tube. will that lower my gains? mess anything up? etc? I just couldnt get the dang 4" coupler in there suggestions?
 
#2 ·
How did you get it to seal??? when I did the DIY on my f250 i had more trouble getting the 4" into the filter than I did in the intake....... is the intake tube on the excursion not the same as the one on the 250?
 
#4 ·
Shouldn't cause any problems - what did you use for
The coupler ? I just redid mine yesterday and had a piece of 4 inch exhaust left over from my exhaust install and getting it in the intake was easy but I had to work it into the filter. There is a write- up with flow rates somewhere on here and even at a 3" opening I believe you will still be 200% better flow than over stock
 
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