Hi guys,
I've got S54 swap from e46 on the way. Cooling, electrical and all other things are sorted expect intake setup.
As far as I know, due to S54 high flowing head it requires dense and fast moving air, which is no problem with stock e46 setup. But it simply doesn't fit in E36.
With K&N or similar pod filter it will lose around ~30hp. It was tested locally on a dyno with huge ventilator, first pass with hood open and second with shut on a friends swapped e36 drift build. He mostly uses without hood in events, so there's no problem for his application.
The closest thing I've seen was stock e46 m3 airbox with cut down lower part. But that way you still get hot air from engine bay.
I'm looking for working kits or DIY examples to feed cold air. Carbon intake is not an option at the moment and Z3M S54 one as far as I know is restrictive and very rare, haven't found one on ebay or elsewhere.