I have bought two pair (plus one single can, don't ask ).

Anyways I got the 250mm ones, and I love the power delivery. My MC28 had what I am thinking were like 310mm aluminum cans on it, and these 250's really gave me some good mid range feel over the longer ones.

I am running with no brackets, and have had no issues at all. If you are using a heavy (stock) set of chambers, you may want to use brackets to help out the single bolt on the chambers.

thanks,
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Charles Gallant