I've been looking at a 1.4CL to get. I took it for a test drive today, and as had been said, it had a noisy diff. It's done 120k miles. How concerned should I be about this, and how easy/expensive is it to replace (the noise is beyond 'repair', it's quite growly in the turns)?

Thanks for your time, and if I get this, expect to see me around even more