Welcome to genvibe!
"Exhaust leak" is pretty vague. Definitely get this fixed!
If it's the pipe, based on age and mileage, it might be wise to replace the pipe (including the cat & resonator) from the exhaust manifold to the muffler. There are 3rd party bolt on replacements that are under US$300. if you do, be sure to change the oxygen sensors as well (US$150).
http://www.rockauto.com/en/moreinfo.php ... cc=1432957
You'd be good to go for another 150,000 km. Your exhaust would outlast the odometer, but not the engine...