MINI UPDATE:
So as a little trial I decided to buy this new kit from TS...It's part of there new HP series.
One of the issues with the normal WG spring setup is:
1/ limited to 26 psi pre load spring rates...and you need to install like 3 springs to get it to 26 psi...pain in the ( )( )..inner, middle and outer springs...
2/ over time the springs become weak and don't hold boost...
3/ installation is a bitch....if your trying to install the springs on the car....which your not supposed to...I cheated when I installed my 18 psi pre load springs....
The HP range has a pre load spring of 25psi ( the big farker and its stiff as!
) and 10 psi - with the total combination of 35 psi pre load......There's a 40psi one as well...
Not that I will be running this amount of boost....
..Stagea M35 anyone with 30+ psi....? ....for me I'm sticking to the 25psi one only
Thanks to Scotty's customs for the recommendation....Will get this installed soon and once I get my retune done...will have my findings and post results...
http://www.turbosmart.com.au/news/new-release-turbosmart-hp-wastegates