FWIW, published card speed relates to uploading from the card to a computer, not the speed a cameras can write to the card. The camera's buffer is more the limiting factor as long as Class 6 cards or faster are used.
Flash memory - Wikipedia, the free encyclopedia
The Canon T3i is an entry-level consumer grade camera and being able to write 6 Raw files in a burst is actually pretty good for an entry-level camera.
If you want faster and longer burst mode than that, you would need to upgrade to a prosumer or pro grade camera rather than just a memory card.
Any sufficiently advanced technology is indistinguishable from magic. - Arthur C. Clarke