I just dropped my car with Basic Tein coilovers and i was wondering how do i know when to get a new camber kit? right now i have my stock one with those coilovers.

 

There is no stock camber kit. lol.

This is how you know whether or not you need a camber kit:

get an alignment. If you have lowered your car and haven't even done that yet, then you are probabl eating away at your tires very quickly simply due to changes in toe.

it's that simple. If your camber is below -2, then I'd say yes. If it's somewhere between -1 and -2, maybe, if it's above -1, then don't worry about it.