If it's a leaking exhaust manifold, I guess the only fix would be to pull it off and put in a new gasket. I've replaced my turbo, which has the manifold attached, and it wasn't that bad.
If it turns out you have a cracked manifold, you might have to replace the entire turbocharger, since it's all one unit. Consider a VNT-17 if you have to go that route.
I know it looks difficult, but once you remove the plastic ducting that goes behind the engine to the turbo, and the EGR cooler, it's surprisingly easy to get the intake manifold out, and then the turbo. However, I wouldn't attempt it if you aren't mechanically inclined as your car will be inoperable until you get it back together.
I hope you're right about the exhaust, as that is an easier fix than replacing the cam and lifters.