i am gon' lower my car this Friday Night w/ a coilover.
i heard that the car only can lower up to 1.5 and if i wanna drop lower than 1.5 i'll need arm (control the tires)
is this true?

 

well judging by the question im guessing all you have is the coil inserts. I must warn you if thats what you have you will most likely have a bad ride quality from it, and it may end up doing damage to the struts.

But what you are gonna need is a camber kit, otherwise you will notice negative camber in the tires and you will have an uneven wear in them were the edges of the tire will start to wear out

 

where can i get the camber kit? how much is it around? is it a bolt? can i get it at any auto store?

 

Before you waste your time and money, are they e-bay junk coilvers, or real coilovers? Expect to pay 1k+ for real ones.