What do they actually do? Does it increase performance or noise?
Panel filters
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#1
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#2No difference in noise.
Should help engine breathe better... in theory. -
#3drill the airbox aswell and derestrict the box aswell, and a good cold air feed.
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#4i went for a K&N pannel filter with a good air feed, seemed to do the trick for my car ran great. didnt get any noise off it
here is a pic if its any help
