when we compare the performance of the 1.8 to other 1.8 cars we should not forget how silent this Stilo engine is and this can be a bit misleading from inside the car...you can assess the full power of 133HP only if you use an outsider professionally measuring your times etc but from inside the cockpit it seems slower than other cars only because is less noisy and more comfortable...the 1st day I drove the Stilo 1.8 (not mine but another one for a test-drive) I thought that this car was too slow for a 1.8, I could not even hear the engine (scary!), then when I looked at the speedometer I could not believe my eyes@: the feeling of speed is distorted, it seems always a lower speed than the real one because the car is very confortable and the engine extremely well isolated both in terms of vibrations and noise.
I had more then one person in the car as passenger who asked me if the engine was still on when I stopped the car for something and the engine was always on but you cannot hear it: at higher speeds the noise is not as you would expect, it is sensibly lower, and our brain often, incorrectly, automatically links the speed to the engine noise.
This 1.8 performs excellently and it is very silent.