Naturally, we know a fair bit about the Intrepid class due to the adventures of the USS Voyager. I've tried to keep the speculation to a reasonable minimum, and have based most of it around how the warp 'pollution' problem was overcome. Since the Warp 9.975 figure for Voyager was described as her "maximum sustainable cruise speed", I've speculated that she could do a little more flat out. I know Voyager has been shown to have a top speed somewhat less than this, but given that Voyager doesn't have access to proper maintanence facilities and has taken heavy damage on numerous occasions, I don't think it's unreasonable to assume that she wouldn't be entirely up to spec.