Air filter directly on throttle body coupler size?

[jshouse]

My MAF was 3". i went to Lowe's and bought some black rubber plumbing fittings that were 4" to 3", and they worked perfect.

i had to elbow off of the TB with a 4" elbow, use a small piece of 4" PVC into one of the 4" to 3" fittings, then went to the MAF, then went through one of the fittings, through another small piece of 4" PVC, then up to the 4" cone filter.

very redneck...lol