About how much would it cost to change a timing belt on a madza 6 i would like to change it before it breaks.?

its easy to do yourself, get the book and you will see, probably a feww hundred bucks,, thousands if it breaks,, go to askmyautomechanic.com these guys are greatAbout how much would it cost to change a timing belt on a madza 6 i would like to change it before it breaks.?I dont know why you would change something that works unless you have too much money on your hands.About how much would it cost to change a timing belt on a madza 6 i would like to change it before it breaks.?WHATS YEAR AND ENG SIZE I THINK IT HAS A CHAIN NOT A BELTAbout how much would it cost to change a timing belt on a madza 6 i would like to change it before it breaks.?i have a 4cyl 2.2L motor and i put one on every 80,000 miles