wrz0170,
the housing input was change from if I remember correctly from 3/4" to 1" some suggest this should improve performance, but if you use 1" tubing and change right at the housing to either straight to 1" or to 3/4" there shouldn't be a big difference,
the main thing I like about the new housing is that is air tight, giving better controller of the air, but try to put some teflon tape on the join and that will improve things, good luck,
sam