"To replace the turbo to manifold gasket, do i have to remove the turbo?"
Yes you do. How else would you replace the gasket in between the turbo and the exhaust manifold?
It's really not a difficult job, you just have to remember where everything goes, and hope you don't break any studs or bolts. These cars are 20 years old and things that have been together that long don't like to come apart.
"Also, if I have to replace the wastegate actuator, do I have to also replace the Turbo? Is it easy to replace the wastegate actuator and rod?"
No you don't have to replace the turbo to replace the wastegate acutator. Once you have the turbo off it is very easy to replace the wastegate actuator and rod. Actuator is bolted on, rod is held on by a tiny C-clip. You will need a pair of C-clip pliers and I'm sure the clip/rod/actuator is a dealer only item. Turbo must be off the replace the wastegate actuator.
Where about do you feel the exhaust leak? Can you hear it while in the car driving? If not can you hear it while you are under the hood and someone else is reving it?
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