Hi there,
The system is our variable tone and boost actuated design, so you get a larger throw between quiet and loud. However, when the car is not boosting, on tickover, just pottering around or cruising which is probably 80% of the time, the exhaust note is just marginally above the stock GTi sound - however, when the boost starts to grow the exhaust note chages directly in proportion to the demand for power to the point where the centre silencer is completely bypassed, creating a completely unique combination of exhaust sounds.
This linear power delivery also dramatically benefits the low down torque.
You could say that it is Jeckyl and Hyde in nature, or perhaps two for the price of one, or to have your cake and eat it...
At this point I'm running out of metaphors to describe it other than to say it is addictive once experienced.
Cheers
Nige