Here's a cool thing I also did. With plenumed ITB stacks and the actual air intake in front of the radiator...the musical tones are faint.
So, I added a diaphragm-ed tube connecting from the plenum...into the car's ventilation system. By playing with the membrane and orifices you can tune both the tone and loudness to taste.
Works great, and you can hear it in most of my videos. This is back when I had Ohlins, which you can spot lower right. Now the car has Xida ACE semi-active, alloy drop spindles, alloy arms, spherical bearings instead of rubber or poly bushes, etc.
That strongly resembles a silvertop or blacktop intake manifold ? what is it ?