its already known that the benelli is a Yamaha R6 derived engine therefore a full system for a R6 will bolt on nicely and being underslung and body hugging you could have saddlebags no with no worries of it over heating, i saw the post where it said should dyno it but just putting it on a dyno just tells you the power at the crank and rear wheel it would require a remap since its a Fi bike to gain more with a race exhaust on, but remapping you accomodate the lack of back pressure with more fueling or more air to keep the torque in the sweet spot midrange and map it for a increase in power in the top end as well. fuel injected bikes suffer if not mapped properly where as carb bikes the lack of back pressure causes more suction into the cylinder for fuel meaning even running with a cat on a carb bike it will be better suited but a jetting will still be better especially as most carb bikes are set up stupidly lean now to pass regulations

i run a cat free race exhaust on my bike with no db killer. my fathers bike also runs a cat free full system and has been remapped a increase of torque by 6% throughout the ranfe and a increase of 5.5bhp

Kennon