How to care for a new to me speed3

Hello! I am currently deciding between 2 different Speed3's. ones a 2013 with catback exhaust and an air intake with 60k miles, and the other is a 2007 bone stock with 93k miles, which i'm leaning towards due to being closer, much cheaper, and is in my state and known to be passing colorados strict emissions tests. if you have any ideas on what to look for besides the vvt and blown turbo, i would appreciate that as well.

My question is, once i purchase one of these, what can i do to ensure that's they will run well as long is possible. i have no plans to modify the car besides interior comforts. should i replace anything of the get go, drive with anything particular in mind? is there any consistent maintenance schedule i should adhere to past oil changes every 3k miles? i haven't looked at the 13 yet due to it being 2 states away, but i am reasonably certain the 2007 is running healthy, no vvt ticking on start and only slight smoke from exhaust on start that quickly went away so im assuming its some form of condensation (i am in a dry climate though so if if you have any ideas of it being something else let me know).
Thanks so much for any advice you may have

 

Hi, welcome.

There is a thread that discusses what to look for when buying and first things to do once you buy.

https://mazdaspeeds.org/index.php?threads/what-to-look-for-when-buying-a-used-mazdaspeed.10009/