GAH! A week after I bought mine. But GLWS.
http://www.z1motorsports.com/350_g35/produ...roducts_id=2854Z1 Plenum Spacer
This angled aluminum plenum spacer for your 350Z - G35 VQ35DE is specially designed to increase airflow to your engine while allowing you to keep the factory strut tower brace. Raising the plenum lets your engine breathe better allowing for noticeable gains in power. This kit comes complete with a new plenum gasket and new bolts to make for an easy install.
I'm interested too... but the website has it for $144. If you cut the price again, (sorry - we know it's all profit haha) I would definitely be you're guy. Maybe i'll contact them tomorrow to see if they have some before/after dyno numbers.