i'm just thinking about changing my stock rims to...these .
i choose this rim cause they are cheap and looks good....but...i think they are bit heavy... Am i correct?
If i get those rims, should i feel, my car is slower? i'm just newbie... help me

 

Yes, they are a bit on the heavy side. I put SSR At1 wheels on my car. The rears are 18 x 9 and are approx 19.5 lbs. You want to have unsprung weight as light as possible.

 

Aside of those rims being heavy for 17x7, I don't think they have a fitment for S2000. 17x7 +40 on all 4 corners isn't going to cut it! Offset is too low and you need wider wheels in the rear (just like the stock setup has)!
Good luck!