Here's a nice pic. Note the subtlety... Heh...
The Volumex was a "Roots" type supercharger, inasmuch as a "Roots" type supercharger is actually a Volumex. The turbo was a KKK. I do not think dump valves were around at the time. The coolers are TMICs, because after all FMICs are rice.
The body (in this case, two clamshells of aramid composits) was designed by Giorgetto Giugiaro, who was named Designer of the Century.
The rear subframe supported the gearbox, engine, and wishbone suspension with significant travel and dual dampers flanking a central coil spring on either side, because after all coilovers are rice.
Flames could exceed 1m in length. Heh.
Here is a used Delta S4 for sale. Price is €430,000.
Lancia DELTA S4 usata 25.000 Km, 430.000 €, a Dronero - 106274179 - automobile.it
Unique view of both forced induction systems from below their respective coolers:
and some flames: