We recently fitted a pair of Turbosmart Raceport blow off valves, these are definitely the best BOV’s on the market. Small, lightweight, good looking and top quality. More details and pricing on our website here http://www.garagewhifbitz.co.uk/index.php/nissan/gtr/blow-off-valves-bovs.html
I also made up 2 aluminium pipes to mount them and gave them a good polish too. Engine bay is nearly finished now, just waiting for my catch tank to arrive this week and that’s it under there, looks wise anyway.