These tubes are pretty much impossible to find now, so I printed my own. This should fit any 3rd Gen Prelude with a B20A or B20A5 engine.
Print it out of a soft TPU. I recommend Ninjaflex. If you try another material, remember that engine bays get very hot.
It will work best on a dual extrusion printer with dissolvable support material. I also recommend using a torch or lighter to clean out any strings on the inside. You don't want plastic getting sucked into your engine.
The author marked this model as their own original creation.