Hi
Here are a couple of strength upgrades for B4 based cars, I suppose they will fit the b4.2
Wide Bumper
http://www.ebay.co.uk/itm/RPM-RC10B4...-/251771371323
Super strong front wishbones
http://www.ebay.co.uk/itm/RPM-Associ...-/281520451868
Hope this helps
Brett