Aftermarket ABS system?

yeah i believe that even F1 have ABS so i would say that even the best have some requirement for it.

i thought abs isnt allowed.... as this would allow them to go faster, and they dont want them to do that (like thats why the grooved the slicks)

ABS hasnt been proven to be better in the dry and may SOMETHIMES be worse (stoping distance wise) BUT in the wet they are undfoubtly the best this to have.

one good thing about it tough is that one can mash the brake and not lock up, therefore still allowing you to steer

Well that's the hole point.
Sure on the track after a few laps you can tell where you should start braking, how hard to press the pedal etc
But it's the sudden panic situation where people just slam the brakes as an instant reaction.

The MR's had ABS but once again I think the only standard brake hardware on my car might be front brake lines... and even that might have been changed over (I know the rear has)
Maybe FTO ABS? Might as well put in traction control while am at it. I know I have the traction control sender things on the driveshafts

On the road ABS is king.

On the track, it's a waste of weight and space in a race car. It's alsovery dangerous when trying to stop an out of control car with slicks on grass.............

F1 don't use it anymore. Besides being banned, it was only found to be of any benefit in wet/slippery conditions and even then only on slower speed corners. Typically it's only amateur drivers trying to drive cars past their skill level that want it put on track cars.