What's your curb weight?
 

How many pounds have you guys been able to shed off your gk5's?

I'm guessing I'm around 200 pounds so far.

how did you do that ? , removing the engine doesn't count

Removed Passenger seat, rear seats, spare tire, All the speakers and door panels, carbon fiber hood, lighter wheels and tires, lighter muffler, intake, header.
I might remove the AC eventually in the future.

Am sure mine's more or less the same as stock, only change I've made with something substantial size was put on a Tanabe axleback, and added the Progress rsb.....so, it's likely about the amount that the rsb weighs, although I've lost a lot of weight over the last year or so, so when I'm driving, it's lighter than with me driving it after I bought it....I know that's not "the weight of the car," but have lost about 50 lbs, so, that helps a lil, although I'll notice it more on my bicycle this spring, if I quit hurting myself. A mid-20lbs bike (guessing) will definitely notice a 50 lbs less load than a 2600 lb car, but, hey, every little bit counts

I lost 35 pounds in 2020. Does that count?

1.2-1.3% weight improvement. Congrats hope you're healthy :).

I really want to go lightweight, but I also want to cover the whole interior with sound deadening mats. How much of a butt-dyno improvement does taking the back seats out really yield??

Passenger seat
 

what did you do with the passenger seat belt? I was going to remove mine once and fretted that it would not pass tech... I am eventually going to gut my Fit and add a rollbar, coolsuit reservoir, and fire suppression system, no AC, no EGR, custom intake and exhaust. I'm also adding brake ducting. I've added a front spoiler and have a rear spoiler on order. I am hoping to be near 2200 with 1/4 tank of gas when all is done...