[kon]

The 1.8 BP engine in my 2004 NB2 actually makes 152bhp in its standard form, not 133. They are meant to work quite well with aftermarket turbos, without needing to upgrade much else. The big brake conversion is always a good idea tho.
The problem I've seen with it, is that it's now quite old, so isnt well-suited to running the latest E10 petrol, and I believe it's a Euro3 emissions class, so isnt allowed into ULEZ areas (without a hefty fee).