first off... which mazda 6?
Mazda 6i 2.3l 4 cylinder?
Mazda 6s 3.0l 6 cylinder?
Mazdaspeed 6 2.3l DISI Turbo 4 cylinder?
as far as I know there arent cams for ANY of the mentioned setups. I, however, dont focus much on the Mazda6 performance parts... I only have basic knowledge of whats available.
In either event, if they arent available, you could have a machine shop make a custom one-off set... but youd have to know what youd need.