maybe the xB idk...

went and took off my k&n cai and installed my stock air box (testing / errr more like working on a theory and no my cai isn't for sale)

when i took off the air filter off the cai and found a couple of wear marks that wore threw the prefilter and working on the filter it self i didn't really look too hard on where it was rubbing at so idk about that

just a little heads up

 

Is your fender lining okay? It's almost like it was rubbing against your tire or something. The fender lining on my passenger side is worn out. It's probably from the air pushing the fender lining onto my tire when I'm going 80+ on the highway. *shrug*

 

don't think its the fender liner

more like its the plastic pieces that are on the bottom just can't think what there called

 

The wind deflector type things? The filter might be rubbing against the screws/fasteners that hold the fender lighting/wind deflector to the bumper... *shrug*

 

the plastic pieces that are on the bottom=lower engine covers-left and right.

 

found it its called engine under cover...

and i don't think it was rubbing any fasteners imma think its from the ribs in the plastic mold

i'll check it out later if i remember to do so...

 

found a some what of a good fix for the problem

http://www.trdsparks.com/displaypart...2&parts_id=463

ruin the shield and not the pre filter and filter then i know i'll be set to go then...

 

forgot to add that the cai does improve mpg... i can tell with my vacuum gauge... just don't know how much yet...

since we already know that the stock air box is restrictive makes the engine work harder vs the free'er flowing cai/sri= less engine strain...

btw my theory failed, idc didn't cost me any thing to test anyways...