Does anyone know anyone who can fabricate a custom intake plenum for a FI Z? In my mind I am thinking of a welded sheetmetal plenum in the shape of a rectangular box (with sweeeeet aluminum welds) that sits on top of the lower plenum with very short direct runners.

Respect
JET

 

well both CJM and SFR are about to unveil their own plenums.
The CJM will probably be close to what you are looking for. The SFR is a dual plenum approach (see the thread on thsi site - there are some pics). https://my350z.com/forum/showthread....46#post2007746

I almost had my shop fab a plenum this winter as a winter project but decided against it.

 

http://www.blinemotorsports.com/products.html

Scroll down to till you see the Air Intake Mainifolds.