welcome. Jump into the Polo 9n section for answers around the light weight pulleys. Yes they've been done and I vaguely recall the feedback has been positive. Check out the build threads, the Red Devil thread details light weight pulleys, as do a few of the other build threads. I wouldn't think 80k is pushing it, but would be dependent on the age of the vehicle. If it's an 06 model, than yeah I'd be thinking about getting it done, but probably not rushing.
Also check out the forum vendor area to support those who support the forum. My experience with the vendors have all be +ve.
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