klickitatsacket
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A muffler modified 660 will have a little wider torque band, but yes a good modified 460 bb will keep up with them in the same wood with a 28" bar and chain. As for longevity; so far so good with no problems since they came out. The big bores hold up very nicely. The only problem that I know of was a circlip problem that Bailey's (another sponser in here) fix instantly. Just a note about Bailey's; they are a great company to work with and if you ever need anything you can count on them to deliver. There are definately some things that need to be changed on the bb to get the best performance out of them but over all are a great value compaired to the over priced stihl alternative. So far not any down side to be seen when purchasing the big bore kits.