Tenor, alto, Bb Clarinet, Flute
It seems that many of the snake oil salesmen want us to believe their Klangbogen or dense metal lyre screw affects and enhances air flow inside the instrument. The reality is there is very little air flow in a woodwind instrument. The air is essentially sitting there inside the instrument and the molecules that make up the air are set to vibrating by the reed. When you blow into a sax or any other woodwind you don't really blow much air. It's just enough to make the reed vibrate and probably not enough to make a strip of paper, or a feather, move if laid across the end of a sax, clarinet, flute or bassoon. I'm sure if you used sensitive enough instruments you could measure the volume of air moving through the instrument over a given period of time but the flowing air is not what is making sound. It's the vibrating air molecules knocking up against each other, transmitting energy from one to the next, and causing a wave to spread out like ripples on the surface of a pond.It's possible material may make a teeny difference, but not because of any acoustic properties, merely that different metals may react differently to the way its is formed., e.g. when tone holes are extruded the geometry of the "corner" where the tone hole chimney comes out of the body could have a slight different angle/curve . This is a small difference but it only needs a small difference at such places in the body to affect the sound.
One other possibility is the roughness of the finish on the inside, but most metals would have a more or less identically smooth finish.
So these tiny differences in bore geometry may make a difference, but not the acoustic properties, or "resonance" of the metal as you would get with instruments such as drums or guitars.
Did your friend explain why the material wouldn't make a difference? I'm asking that because people who think it does, seem to think it is because of the vibration or some kind of resonance (as with drums or guitars), yet these factors as far as I can tell are nothing to do with klangbogens which claim some other kind of theory.