ahh i think i see wat your trying to do mate. u want to plumb it back. DONT BOTHER. that is a bitch, and at the most all it would take is the plumb back adapter and maybe half a foot of 1'' rubber hose.
anyway. if u just block off the stock return pipe, and bolt on the ssq with the adapter. it will take about 15min. take out 2 bolts, take off stock bov. block return pipe. stick on bov with adapter and stick in the 2 bolts. thats it. i really dont see how its that difficult. i might suggest that your so called 'tuner' either doesnt know shit all. OR he has seen u coming a mile away. and would like to make a quick buck.
adapter shud look like this
http://cgi.ebay.com.au/Skyline-GTS-BOV-ada...bayphotohosting