I don't know if all DA40's have the powerflow exhaust, but the DA40XL does (I thought this was one of the differences between the "normal" and XL versions) and it is certainly quicker. 150 kts TAS at mid levels.
We're going down a different route in our aeroplane, by reducing drag. Aileron and flap gap seals, different fairings to streamline the beacon, modifying the angle of incident of the tail plane (through an STC).....vortex generators.
If we get another 10 kts then I'll be very happy
