in drag race does it make any different with or without limited slip
for c32 step2 350hp at wheel? the reason i asked because after i
install the limited slip it feel hevier and slower take off.

In drag race? Simply put off the line you should have better acceleration due to power hitting both rear wheels consistently. The difference I'm sure is a lot more noticeable with modified C32 at higher HP. If you feel heavier, and slower I'm not sure. Maybe that feeling of spinning the tires a bit got you off?

my understanding was that a properly set up lsd should make our amg's 0.1 to 0.2s faster from 0 to 62 mph. This seems weird to me that your ride is slower. However not easy to install since it needs to be 'coordinated' with the esp which is tge tuff part imo

Have you taken the car to a track in very similar weather, with similar track prep, before and after the LSD install? Chances are that you're not slower now but you have more traction which may feel slower. If you've got low traction, the engine will scream through the gears and SOUND faster than if you have good traction and the engine has to spend all of its available power to move the car. Just a thought

Also, try experimenting with your launches.

thank you everyone.