Fuel injectors and lawn mower sounds, not exactly what one would expect from a bad injector. Lawn mower sounds are usually what the average customer refers to when they have an exhaust leak. Is your car a turbo? The injectors are not too tough to do on that car. There are special tools required to do it by the book, they are a set of clamps that hold all of the injectors into the fuel rail while you lever the whole assembly out of the manifold. It is fairly easy to do it without them, just be careful and keep all of the injectors in the fuel rail. You can try squirting a little bit of penetrating oil around the injectors where they go into the manifold, wiggle them back and forth a bit and it should come out fairly easy. Disconnecting the supply and return lines pretty much goes without saying.

Mark