Flute; I suppose the best mods are the ones you use (or see) every time you drive the car - the Quaife is brilliant but you don't feel it most of the time. Ditto the intercooler.
So in my case, best mods are:
- M sport steering wheel - reasonably simple DIY and I love its look and feel
- Carbon fibre trim wrap - ditto
- Switching away from run flats - no brainer for me
- Evolve stage 1 remap - excellent value for the power gained
Personally I prefer to keep the external appearance stock; OK it doesn't look much different from a 320d to the untrained eye, but its handsome enough anyway and I like the "sleeper" idea.
Mike.