Kwame found this mod, so first off all, props go out to him. The stock 350Z gas pedal is perfectly straight. The one from the 380RS has a small curve at the bottom, which makes it easier to heel-toe. This is one of the easiest installs you’ll ever do!
The stock gas pedal is secured to the pedal lever with a small plastic clip on the backside. Using a flathead screwdriver, you can easily pop the clip off. Be careful, as you’ll need to reuse the clip later.
380RS Pedal Install #1 - Plastic Mounting Clip
Once the plastic clip is removed, the whole gas pedal will pivot downwards. Once the pedal is flipped downward, just slide it to the left and the whole pedal will come off the pivot arm. Slide the new 380RS pedal onto the pivot arm the same way the old one came off
380RS Pedal Install #3
Next, flip the pedal back upwards so it’s facing you the right way. Take the plastic clip you removed in step one, and snap it back onto the back mounting tabs of the pedal, around the pedal lever. It’s a tight fit and quite dark down there. I used a drop light in the car to make sure everything was lining up, and then wrapped a towel on the front of the pedal and used a pair of pliers to snap the plastic clip back into place. Viola – install complete!
380RS Pedal Installation #4 - Complete!
Here you can see the difference between the 380RS pedal and the OEM pedal. 380RS on left, OEM on right.
380RS Gas Pedal vs. OEM Pedal
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Kwame
Z1 Performance
Jonathan
Corner Balance 
Instead of popping the clip off, I just used the blade on a flathead screw driver to push the clip up and off. Putting it back on just slide it down until it clicks into place. May be easier and less chance of breaking the clip. 🙂
good suggestion Daniel, thanks