* Redundancy and Complexity: Both a turbocharger and supercharger force-induce air into the engine. Having both would create extreme boost pressure, far beyond what the engine's internals (pistons, connecting rods, crankshaft, etc.) are designed to handle. The engine would likely suffer catastrophic failure very quickly.
* Management Challenges: Controlling boost pressure from two independent sources would be incredibly difficult. You'd need sophisticated engine management systems to coordinate the two, and even then, the risks of overboost and engine damage would be extremely high. The stock ECU in a 1991 Talon is not equipped for this.
* Interference and Packaging: Physically fitting both a turbocharger and a supercharger onto a 1991 Talon's engine would be a major undertaking, requiring custom fabrication and potentially significant modifications to the engine bay.
While some highly modified race cars might use multiple forms of forced induction, these are extremely specialized projects with extensive engineering and resources. It's not something feasible for a typical street car like a 1991 Talon.
Instead of trying to run both simultaneously, enthusiasts typically choose *either* a turbocharger *or* a supercharger upgrade for increased performance. Each has its own advantages and disadvantages regarding cost, complexity, and performance characteristics.
