I have just bought a subaru wrx sti prodrive edition. Test drove it, lovely, got a new turbo so was told to run it in fo 100 miles, is that normal?

Also halfway home a loud ticking noise started to come fom the engine, speeds up with revs and slows down when braking but always ticking now whenever i start it up. Im worried ive bought a dodgy car.

Any ideas please...... thanks

message me on here or tj_tierney@hotmail.com