humber pig that brought back a few memories- the RUC used v8 landrovers with custom exhausts they sounded mean in the dead of night!
The Pig was also used by the RUC in the early years of the disturbances (and before that) these vehicles were painted either white, dark blue, military green or grey.
The thing about the Pig was the sound that it made - as I mentioned before - however on a light throttle at unhurried speeds you could hardly hear them.
The armoured Landrover (based on the 110 chassis) was a natural but very necessary progression from the grp plating that was put onto vehicles to offer crews some protection from bricks, nail bombs and so on - but not from high velocity ballistic impact.
The first incarnation of this vehicle, if I remember, was the Hotspur which featured full ballistic armour and glass, the tyres were run flat insofar as there was a band placed in the well of the wheel that prevented the tyre from running off the rim.
Later incarnations were called Simba, Tangi and Tanga and were developments of the original Hotspur vehicle with improved armour, access, accessories etc.
Needless to say these vehicles needed the V8 to cope with the additional weight carried - and you're quite right K, at night you could hear them from miles away.

Some photographs of Tangi models:


Thanks to overclockers.co.uk