i have a k&n from my G20 that has a 4" opening because the stock copper colored airbox piece was 4". i came to realize the other day as i tried to put it on that the maxima has a 3" opening. and also the 4" piece from the G20 doesn't fit the maf on the maxima(duh). are there any adaptors from a 4" to a 3"? or am i just screwed and have to buy another 3". if thats the case i guess i can sell the 4" one...thanks