improving engine internals

I have a 2007 Honda Accord v6 3.0 4door
and I've recently decided that I want to do
something's the engine internally but I'm
having a hard time finding anything ..I've
looked at a few sites andI filtered it down to
the identical car and it says at first the parts
match but when I actually look at it it's only
for a certain model that does not match up
with mine..... Really I could just use a little
bit of guidance where to start