i am 17 my dad didnt want me to get coils cuz they cost as much as the rims did, i went with tein stechs, lower then what i expected but stiffer, i just said that nothing will have to be fixed or an alignment isn't needed, i got the springs off an ebay dealer, not a no name person, got em for 179, did all my research, did all the work myself, no need for any alignment, i went to a volkswagen mechanic, hes going onto his 17 year of being a mechanic, he said i did a good job and amazingly didnt need an alignment because of it. usually people say an alignment is needed after getting new coils or springs or whatever but if you do it right the first time your good. just if you do end up doing it, make sure you know to use a widow maker and WD40 to get the strut out, use springs clamps to get the springs off, and the wedge has to be the same as stock, youll see what the wedge is when you pull it off of the car, its on the top between the spring and the compressed strut, if you keep those the same as stock your car is good, and this is with any lowering/stiffer springs, not coils.
my mom didnt notice, my dad said he likes the newer mazda feel and look, meaning low and stiff lol