z6 and w9 are both JDM spec motors...while the Z is more common and widely seen. you have to keep on trying with google and im sure something will come up.
when i say...vtec messes up with turbos...that doesnt mean it is impossible to do it.
The idea why a vtec cam is not optimable for forced induction is because the vtec cam was designed for a naturally aspirated engine.
NA Cam design: High lift and long duration.
Turbo Cam Design: High lift and shorter duration.
Why: duration means how long the cam opens up both the intake and exhaust valve at the same time. Turbo cars have a very high pressure on the exhaust valve because of the restriction of the turbo. If the exhaust valve is still open during the "Filling" stroke of the engine then exhaust will reverse it's flow back into the cylinder contamination the fresh intake charge.
At the end...it all depends how do you tune your turbo setup....most turbo setups end up in crap cuz of bad fuel management setups. u need someone who really knows what he is doing.