I have had time to go searching the net tonight looking for info on the VQ25DET.
I have come across a site about some one who has done every possible mod to the M35 inside, outside and to the motor.
Not only has he improved the turbo and the manifold but he has taken it out to a 3.5L VQ25DET.
http://translate.google.com.au/translate?h...N%26start%3D150
Have a good look over the whole site and look for items to click on as there is all sorts of information in the background.
It looks like it is a company called TEPS that does most of the mods and using a Fcon computer.
This is soooooo interesting.
Cheers
Andy