Putting the 1m on a stricter diet with new G87 m2 carbon bucket seats, 

I've been playing with some late model M seats for awhile and share the exact differences between all the series and aftermarket seats to see what is the lightest and their pros & cons.

As I play with different seats in the future I will be adding them here and Facebook @1m3.

E8x & 9x Electric seat is 29.8 kg or 65.7 lbs.
E8x & 9x manual seat are 24.4kg or 54lbs
m2c/m3/m4/ seat is 26.1 kg or 57.6 lbs.
m4 competition seat is 25.8 kg or 56.88 lbs.
Recaro CS by BMW Performance is 24.2kg or 53.3 lbs.
Recaro CS by Recaro with Recaro mounts is 21.8kg or 48lbs
G8x Carbon bucket seat is 21.7 kg or 48 lbs with electronic adjustments.
G8x Comfort Seats are 24.5 kg or 54 lbs with extra electric comforts.

For comparison the Race seats are:

Velo GP90 xxl is 8.4kg/18.5lbs or 13.1kg/28.8lbs with rails and sliders.
Pole Position are 7 kg or 15.4 lbs
Pole Position carbon are 4.5kg or 9.9 lbs
Alloy brackets and steel rails add 2.2 to 4.5 kg or 5 to 10lbs to the weight depending which ones you get.
You also have to add sliders and floor mounts of at least 10 to 15 lbs.

But I hope this will satisfy peoples curiosity.