I bought a full set up, with open cone " spectre " filter...
as i began lining up the intake piping, and noticed that the piping i bought lined up great with the factory airbox. so i put on the 3'' coupling into the airbox, and it was almost snug, but not quite. so then i thook a trip to pepboys looking for a 3.5'' to 3'' coupling. of course they didnt have that, so i bought a 4'' to 3'' reducer coupling. 4'' end was to large, so then i opened up the cone filter box, and the filter has 2 reducers. a 3'', and 3.5'', i then took the 3.5'' reducer, and placed in the 4'' end of the coupler. the fit is snug, and perfectly fits over the round edge of the MAF. then i secured the 4'' end with a clamp, and it sealed pretty well...