Clearly, from the picture, this pipe is a monster. This is the Malossi MHR exhaust for the Vespa smallframe. It goes great with the smallframe MHR cylinder but will work fantastic with the regular Malossi cylinder as well. If you want a smooth power curve with what feels like limitless RPMs than this pipe is for you. If you like to irritate your neighbors, this pipe is also for you. It is possible to this exhaust with the 19/19 carb but a larger carb is recommended for maximum power and enjoyment.
If trying to fit this exhaust to a smallframe with the left side battery compartment you will have to do some modifications to the frame.
