I think for any "ram effect" to take place, you'd have to be doing about 300+ mph....
the air has to travel down the pipe, through the air filter then through the turbo... i don't think any amount of speed will give you any extra power.
the only vehicle i've ever driven where air was forced in through "ram air technology" was an old kawazaki ZZR400 motorbike, there were 2 pipes from the front fairing straight into the air box, about 12" long, and fairly straight. even then the effect only came into being at above 100mph.
on a disco? forget it! fit it with the top facing backwards... that way you won't get leaves/bugs/water/general cr@p being sucked down it as much.
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