To me bolton turbo kit wth proper fuel management yet running low boost is better then Swap. swaps are even more headache.Rebuild is must manytimes on these kabuli engines after some times due to cloggin as no one knows for how long they r being lying in a junkyard.Yet for everyday option N/A setup is best option.
I my self own D16w9 .Alhumdullilah it has now done 184k kms on genuine internals and im running some boltonns on it for quite long.
If you go for Intake , Headers ,down pipe n mufller ,good quality plugs ,Vafc 2 or vafc neo for proper fuel management u can gain like 10 15hp catch sum 1.8 civic n some lazy 4AGE cowrolla aswell
other then this go for CF hood trunk etc it will giv good looks n weight reduction on same time