Snapping an ARB is an achievement worthy of a big cigar and a large whisky.....it just never happens!
Just get the Eibach ARB kit. A big bar at the back with the stock front just creates an unbalanced car. The front rolls as well. MK5s can be quite tail happy on the limit, so best to upgrade both bars rather than making it even more unpredictable with just an uprated rear bar.