bought these dumps but have since decided to go with a big turbo upgrade and require 5 bolt dump pipes. these are for stock turbo housing. they are the split dump type which is superior to the stock setup as it reduces the turbulence created when the wastegate opens. gives instant HP gain. $150
http://www.pexcom.com.au/z32cms/e107_images/NPower_Dump_Pipes.pdf sorry not sure how to include pics in post but heres link with pics