I am swapping coilovers and the height will remain the same. Do I need an alignment?

 

Though, in theory, you're not changing the suspension geometry; but some say regardless you should and some say you're fine. It's really up to you and what you feel is best.

 

My dealership will check the alignment for free.

 

edit: disregard

 

you need an alignment anytime you take apart the suspension

 

^ Listen to this guy.

 

Yes u need realignment

 

it's not just about lowering
when you're messing with suspension components your alignment will change

of course you don't NEED one, just means you'll risk wearing our your tires faster and unevenly, as well inferior handling