Silvercan question...

Sorry guys, I know the answer will be on here somewhere but I hoping those in the know can answer my question for me.

I run my Mabuchi silvercan which I got with my standard M05 kit without any tricks or mods apart from soldering on 12awg wire and gold 4mm Tekin connectors.

Off the shelf, is there a silvercan that is faster than the rest? Or is it a case of buying severall and testing them?

Cheers!