Certainly not as fast as the aspiration system, especially a quad charged monster like that, even on idle.
Don't think there's a lot of backpressure anyway, I'd imagine it needs a pretty much free-flowing exhaust system if those 4 turbos build up pressure.
Not like I know anything about that stuff though ;P
The kind of spanner stupid enough to use a mobile phone while driving, and stupid enough to swerve to avoid a bird. It's not even a proper crash, the car probably tried to kill itself due to the shame of being owned by such a ****ing tool.
well thats only if the airbox is clear of the water but the exaust is uner the water, in this cse the engine sucken in water from the intake side because it was run with the airbox underwater