Whoa...nice

Great

so the Berk exhaust is about 20lbs heavier than FI?

Yes, of the exhaust reported FI is the lightest aftermarket, though I am sure some others are a bit lighter which have not been reported.

added

anyone have any info on stock brakes sport and non sport? sport and non sport rotor weights as well?

stock sport FRONT rotors supposedly weigh 30lbs a peice on the 370z, according to racing brakes
Two-piece rotor (Open Slot) - 370Z (Sport) FRONT 2009

Which is more than my 19" rims.

Damn, 30 lbs. Definitely have to look into getting a two-piece rotor.

I assume the drilled weighs less than 19 lbs slotted rotors?

negligibly less.

Figured it would be. Was assuming a little under a pound less per rotor.

Some stuff that I weighed, used a bathroom scale, may be off by a pound or so.
bc br coilovers 54 lbs / stock 55 lbs
HR springs 31 lbs / stock 17 lbs
ichiba 20mm ver 2 spacers almost 2 lbs

How much does the KW V3 suspension weigh?

KW V3 coilovers are too cool to be weighed, chuck Norris will drop kick your bathroom scale.

^Awesome line lol, I ask cus I'm planning on buying them & was wondering what the weight difference was vs. the stock suspension?

i had 2nd, 4th and the reverse gears removed.... reduced weight by about 8-10 lbs. I regret removing the reverse a bit, but im getting used to putting it in neutral, opening the door and pushing with my foot, so its not so bad