Gotta love people like this that have nothing better to do than join to trash talk, but go as far as to make another tread on another forum to do the same thing.....
http://www.talkaudio.co.uk/ipb/index.php/topic/368562-dual-tweeters/
I would assume they fit shca 2/0.
Would be kind of redundant to ship 2/0 lugs that don't fit their 2/0 cable.
Not really, they have 1/0 lugs on e-bay that doesn't fit their 1/0.
That's how 99.9% of companies do it, very few figure warranty length from date product was replaced/repaired. If they did that in theory warranty would never run out.
Depending on what coil configuration you ordered and what your final ohm load is, should be fine. Especially when you take into account box rise, voltage drop ect. you probably won't be seeing "true" 6500 watts anyways.