Pretty sure mine alloy mufflers weighed 700 odd grams when i bought them.
I shortened mine by about 70mm.

And i got them to fit on the factory honda flange. Just had to cut the spigot section down a little and linish it a fraction, and slot the mount holes inwards. The spigot seals on the oring nice and tight.
_________________
Winning isn't everything, but loosing isn't anything