Hks exhaust, stillen headers,hi-flow,intake gen 3

Huan'z

Hi guys I'm newbie from the forum and tuners or mod.
I just have a dumb question about;

Hks full exhaust system
Stillen intake gen 3
Stillen hi flow
Stillen 304 headers

Just got the intake and the headers. Need to save some more money for the exhaust and the hi-flow.
If I'm gonna put that all stuff on my z do I need to do anything els to keep my car last long? Like u need to upgrade this or that to match those stuff for the life span of your engine or car? Please someone give some advice. Will be really appreciated. Thanks!!

And please advice which part is the best one too. Like other brand. But I already bought the stillen headers and the intake. The cost is 1250 shipped. It's free shipping anyway from stillen and no tax