First Impressions
There is torque everywhere, especially noticeable from low revs when in a gear higher than I was used to being in. It's not the shove that I felt in my old twin-turbo diesel, but then it persists and persists to a glorious full wail at high revs. The responses are immediate but progressive and controlling it even in the wet doesn't cause surprises. The supercharger itself is so quiet as to be barely there and, unlike my previous Sprintex, there is just the sound of rushing wind at high revs telling me that induction is being forced. The exhaust note, however, is more liable to be noisy when acceleration is demanded at low revs (this may be especially with the UEL manifold). Cruising on the motorway is no louder than before. There is a lack of smoothness just above idle when pootling in traffic - it's a matter of learning the new throttle response which can feel a little on/off at first. This is where the map feels most different from before.
Overall, the car feels like it wants to go at any opportunity and advanced planning for certain overtakes just isn't required any more.
The installation looks very OEM, you could easily believe that the car came like this from the factory.
Pros
Torque across the rev range
Fast responses
Lovely acceleration note at high revs
Overtaking in 5th brings a smile every time
Feels genuinely rapid now
Cons
The exhaust note can be anti-social when giving it pedal at low revs
Difficult to be smooth in stop/start traffic