If your vehicle is hissing, it could mean there is a crack in the exhaust pipe, manifold, or a leaking gasket.
If your vehicle is chugging, it could mean a blockage in the exhaust system.
If your vehicle is rattling, your exhaust might have become misaligned.
You wouldn't be the first person to ignore exhaust issues. If you do, the result might not be catastrophic but will likely build over time. You'll probably experience decrease in power, acceleration, and fuel economy.
An exhaust leak is actually likely to help your turbo spool, since some of the exhaust is escaping before the designed exhaust system. However, we strongly suggest that you fix any leaks. They aren't going to sound good and could make you sick.