There are differing opionions on this one.
The Pegaso suffers from a "dead spot" in the throttle, some seem to be worse than others.
====== The Mod it opinion ======

Basiclly, it involves trimming the "snorkel" down to allow more of an airflow. This process has been documented on the Forum at [[https://www.apriliaforum.com/forums/showthread.php?167471-Snorkel-mod!-The-Guide!&p=2038559&highlight=airbox#post2038559|Snorkel Mod Guide]]

====== The leave it opinion ======

There two reasons why it should be left, in the opinion of  --- //[[bdporter@ytc1.co.uk|YTC1]]//
A great deal of work is performed by engineers and technicians in designing airflow and noise.They don't just do it do the fun of it. On my own bikes I have found it made little or no difference. Using an Iridium plug and a K&N filter is the better option.

The second reason, when you trim the snorkel top, you have less protection for dropping small items down into the air box.:-)