To get expert advice on this forum, you better tell us about your car:
Km driven, is it auto transmission or what etc.

I have a 1996 civic and from my only 8 months experience I would like
to tell you that you check the transmission very carefully before you
buy it.

1. almost every single "cold air" intake sold for hondas take air from
inside the engine compartment and therefore they're not "cold air" at
all.  and they give inferior filtration compromising engine life.

2. there ain't co such thing as "cheap power".  there's cheap noisy that
/sounds/ like power, but if you want the real deal, you got to spend a
little.

the cheapest real deal for genuine power increase is a sport header and
a "mini me" head conversion from the ex.  forget the rest.  also, make
sure you have good plugs, good leads [spiral wound like magnecor are
worth the money] valves adjusted correctly, synthetic oil, quality gas,
clean air filter - they'll all help a little.  that dx is fundamentally
de-tuned, so there's not a lot you can do with it without conversion
work.  my 89 dx used to spank my 2000 dx, so i sold the 2000 and kept
the 89!