Does anyone know this for sure? When Ford changed the airbox on the 2001, did they enlarge the entire box and change dimensions, air filter size, etc, or did they simply enlarge the inlet and outlet holes for the larger rubber boots?

 

They enlarged the fender wall opening and the boot. Turn the box over and cut out a couple section to increase air flow. you will be happy.

 

Twisted can you give a little more detail of what you did? dis you actually change the filter element also?

 

I actually looked at the 01 airbox and inlet boot and it looked the same as my 99. It's suppose to be larger though...

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99.5 red Lightning
13.2@103
01 ordered on 3/17
hud@mc.net