How the hell do you figure that if you flow more exhaust, it will cause a turbo to explode?
The only thing that could, in reality, happen is his cat would
A. Meltdown, and/or clog, or
B. Cause so much backpressure the car would not run, ala sticking crap in the tail pipe.
Both of those two realities would happen way before his turbo even reaches any kind of super-heated state enough for it to cause meltdown/explosion.
-meaty