Your friend is correct the 2.0 16v Turbo is the Integrale unit and can be tuned very well, they are very good cars, I own the later 20v Turbo at the moment both cars are easily tunable to approx 280-300bhp without changing engine internals or even the turbo, just need a catless big bore exhaust, filter,an uprated intercooler and a Unichip and youll be happy.
The 5 cylinder units are one of the best sounding motors I have heard, thats no bias just because I have one, as its up for sale and I am downgrading to a Clio Cup
Cheers