As for tuning, don't mix up N/A engines with turbo'd ones (ie Cossies RSTs). Its not that modern engines aren't tuneable, its just that you're comparing N/A engines! :p Stick Bluefin and a decat on a Focus RS and you've got 265BHP and an even bigger torque increase.

Ok, so Cossies are very tuneable and cheaply to a point but as most Cossie owners will probably agree this comes at a cost these days given some of the engines/running gear aren't quite so fresh anymore.
As for the Fiesta ST150, my Mum has one and I've driven it a couple of times, its a riot of a little car, nicely delivered power and awesome handling/ brakes to match.
