Yeh, in my opinion I think you did get ripped off. I've seen these radiators going for 150 and I can't imagine it would be hard to install yourself. The only downside to installing it yourself is that there would be coolant all over the place. The important thing is that the car runs fine now and you don't have to worry about anything. We have all been ripped off at one time or another so do not dwell on the whole incident too much.

Enjoy the car :

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Audi TT