Absolutely 
But if itâs too loud for a track day youâll get grief from plod too when youâre on the road . . . and the one place you want the most power from the bike is a track day and you have to then stick a baffle in place which will take away some of the benefit of the full system youâve just spent ÂŁÂŁÂŁÂŁ buying 
Simples 
A full system is as much about saving weight as it is improving engine performance, but yeah, itâs a crappy situation that we canât run our bikes in their best trim for trackdays.