[Hi Volt]

Filter is probably correct, this media wouldn't happen to be something like a charcoal filter would it ? Your airbox would be a perfect candidate for the vacuum test I ran before and after the mod. If you feel inclined all it takes is a vacum gauge, 10 ft of hose and 2 threaded 1/8" hose barbs. If you are interested I will give you the full details. You can also measure the restriction of the HC filter to see what effect it has.

Anyway the mod can't hurt anything the way it is done.