iv got a lowerd g40 and in runnin bout 160 bhp and iv snapped 2 driveshafts gettin fed up now replacing them any one had the same problem
its not uncommon to snap the drivers drive shaft on higher powered G's, you need a fatter driveshaft, there was a group buy not so long on uprated driveshafts, look in the for sale section as someone was selling an uprated one not so long ago.
http://www.polog40.co.uk/forum/index.php/topic,3022.0.html
Think it might be sold now tho?
Try not doing burnouts!