These couplers came on my truck when I got it and as far as I know the intake is an AFE pipe and I know the filter is as I bought a new one last fall from them. The couplers are deteriorating and I called AFE with basically no help.
Coupler #2 (notice the different wall thicknesses on each side as this is important for the seal)
Coupler #2 (notice the different wall thicknesses on each side as this is important for the seal)