Since many things are currently out of my car, I decided to weigh a bunch of parts (with my bathroom scale - i.e. not accurate). Some of you might find it of interest.

Stock non-sport seat (leather, heated, electric, including sliders) = 53lb

Recaro SRD = 36lb (incl. sliders) + 3lb seatbelt buckle and buckle/sub-strap mounting plate = 39lb (-14lb)

Sparco Evo L = 29lb (incl. side mounts and sliders) + 3lb seatbelt buckle and buckle/sub-strap mounting plate = 32lb (-21lb)

So, throw in a pair of Sparcos and shed 42lb


Stock flywheel = 14.5lb
Fidanza aluminum flywheel = 5.5lb

Stock pressure plate (incl. ring gear and release bearing) = 19lb
KEP Stg1 aluminum pressure plate (incl. ring gear and release bearing) = 15lb

Therefore, Fidanza + KEP combo sheds 13lb, which works out to a 39% weight reduction.

 

Here's another weight reduction list. Mostly body parts.

 

thanks for the list, just what i was looking for!

 

It's a handy list. I can't verify it all and it's not mine, but it's a good reference.
I got it from here. I think there is a better list in this thread actually.
http://reutterwerk.com/forums/showthread.php?t=10279