[Mx5 Nc, How low?]

Hi

 

I'm new to the forum and wondered if I can get some advice.

 

I have a 2006 mazda mx5 1.8.

 

I have purchased a set of Eibach 45mm lowering springs, my question is......is this too low? 

I have the standard 16" alloys, will they rub anywhere?

 

Also I intend to have the wheel alignment done but if I I  then fit 17" wheels would this affect the wheel alignment again?

 

I would very much like to keep the 45mm lowering springs but if it turns out it's inadvisable to fit them I am able to change them.

 

Lastly, what sort of cost should I expect to pay for wheel alignment designed for road use.

 

Many thanks.