take off the bottom of ur air box so ur stock filter is partially exposed....it'll get a lot more air that way and it costs nothing...u wont necessarily have to buy a filter if ur poor.
if ur not in canada and u dont have to do etest, then remove the cat and replace with a test pipe(about 60 dollars)...it'll free up your high end..
take out spare tire, jack, strip whatever u can...less weight=less of a burden for the engine to haul making it more efficient..
if ur nuts, u could try removing the muffler....it will give u mucho more high end power
now if u have money...as mentioned above, go for an air filter...it's very inexpensive. as for paying for exhaust and a header, that will cost u so i dont recommend u go that route unless u got the cash.
if u still got money to burn u could put on some lower profile tires...make sure the whole diameter of ur wheel is smaller when u do this....ur final drive will technically change and u will get better acceleration.
use syntetic oil...the thinner the better...go for 5w30....or if ur nuts, 0w50 if u can find

it will reduce the resistance in ur motor and potentially give u lost horses.
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boro song
"boro boro boro
here we have a duct tape la la la
here we have an electrical tape du du du
here we have a coke can da da da
and then we have a downpipe!! boro boro boro"