Porsche used the slide valve intakes on the RSR which boosted output +20HP.
Fujimi's RS 3.0 kit includes the high butterfly intake. Not aware of the slide valve setup being available in scale so I will make an effort to fabricate a reasonable replica.
Kit parts I'm starting with:
Modified:
Added the twin plug/twin coil alternator
fabricated some basic linkage
Fuel pump tilting to one side just as Porsche mounted it on the 1:1