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As a fellow CRZ owner, this will be interesting!
Especially the grill block MPG gain/loss and how it's mounted, as i've always had success with grill blocks, but the crz grill being a concave honeycomb isn't the easiest of things to block without it looking silly!
How are you planning on sorting the underside aero? Honda have been extremely generous with the gaps it's given to the exhaust, so it's a bit of a nightmare down there!
Quick tip, the doors and boot (trunk) have adjustable stops on them (2 on each) if you wind them to their shortest setting, you get more pressure on the door seals and a lot less wind/road noise into the cabin.
Also i'd be interested to know how to reduce the size of the panel gaps for the boot (trunk) lid, as they are huge!
Finally, the front aero is there to push the air "past" the mirrors (reduce mirror drag)
and the foglight recesses are to make turbulant/air vortices past the front wheels to reduce the drag from the front wheels, so i'd also be interested to see what there is to gain in this department.