Lowering springs & rear camber
 

Will lowering springs put the rear camber range too negative?

Yes, and you will need an alignment afterwards.

Yes and you will need after market alignments bolts as well. Stock ones will not give you enough positive chamber when you realign your wheels. There are four total in the rear. fronts are fine with stock.

Coilovers, the same issue?

This is a very vague question and I guess the best answer would be that it depends on what you are doing with the car and how low you are wanting to go. What is too much negative rear camber for you? If you are going to be doing some handling style stuff with the car where some negative camber is a good thing than that can easily be achieved with the factory hardware when using lowering springs. If you trying to get close to zero camber in the rear with lowering springs and factory hardware it won't happen, you will either need aftermarket hardware that offer more adjustment or an adjustable lower control arm.

I agree as above and yes coilovers as well. When you lower a car it will force the wheels to negative chamber, so the lower you go the more negative chamber you will have.

I just purchased bmr split drop springs. Will I need new bolts of I go with the performance alignment that you guys recommend?

Could you pm me alignment spec bmr?just bought a set of lowering springs

If I not mistaken I think you can get it from their website. It's at the bottom of the installation instructions