Not necessarily a track build, but a "proper one". Adding power on a stock car will of course exceed the stock characteristics of many components. You don't think cooling is an issue, well let me tell you that with an HKS supercharger blowing 8 psi, it becomes a real problem specifically at high revs /temps, when oil just becomes ... water and tend to starve. Now suspensions, well very true, you don't "have" to, but again, you will totally exceed the grip capacity of the stock suspension, and what's the point to add a lot more power if the result of it is just ... smoke ? You want more power to go faster. Only changing tires is enough ? no it isn't ... more tire grip will again exceed the stock suspension capacity and will deteriorate handling and degrade performances.
And of course, braking is the main issue, you go faster, you need to stop stronger, but again only if you have enough grip and a good enough suspension setup to go with it.
You can throw pads and fluid, sure you'll have more bite an less fade, but is your chassis capable of copping with the stronger energy ?
You might think this is track specific, and that it doesn't make a difference for the average folk, well it just the way to make the best out of the 3.000 and some $ you'd invest in the Engine.
And also, a Etune is just ...Crap, sorry, but no E-tune will ever match the result and satisfaction a real dyno tune will offer. Expertise is everything , and that's why i said , a build like this, with all the right components in the right place would be 6 to 10k$ done by the proper people. Of course if you feel brave enough to do it in the back of a shed with some friends, and again feel lucky enough to gamble on an E-tune then yet again, go for it
One can do much more for much less ?, but is it really well thought ? Done ? Secured ? , I dunno
I am just exposing here how we think car tuning here in Japan through the garages I know, and none of those guys would let someone install a Supercharger without upgrading other components at the same time, or in a very short period of time ... just a different philosophy
And yes I could be considered as an extremist
I know not everyone has 10k$ to spend on a build, and some people are very well educated to do stuff themselves, but our friend here seems at the very beginning of his learning curve, that's why I recommended him a "safer" approach.
But yes it can be done for "cheaper", but it will incidentally be ... cheaper.
you get what you pay for.