Just remember even a stock rotary will be night & day with bigger induction & exhaust they just suck and spit out more of everything. I had an rx5 with stock 13b in the late 80s that when I changed to a downdraft 48mm & headers instead of the heat exchange unit from factory & the thing just transformed itself to easily an extra 25-30hp.
They love to breathe so either IDA or have the 4 barrel worked by those in the know and get headers to suit.