that is not quite true dude.there are a lot of people on this site that knows about the older celicas.
with the Intake
,what you wanna do is get the adapter fo the air flow meter take it to a machine shop and have it modified. or make a new one altogether.
for serious hp.for that car,headers,they are hard to fid though,and you would have to do a custom exhaust.2.5" pipe all the way back.
port and polish work including the exhaust port matching is a bitch on that car as well!
what i have seen people do was take some off the head(dont know how much though)to up the compression and add a fuel preasure regulator to up the fuel.the tranny in that car can take a beatin. it has a w55 i think nasty gear ratios. ironically the new lexus is 5 speed comes with the same gear ratios! the tranny is built like a tank we used to take the tranny from that car and put in the ae86 corollas along with the 3sgte beast! motor plate has to be made though.
its been along time since that car dude!but i do know it can be made extremely vicious with little work.if you by internals and do headwork and run nitrous.(big shot nitrous dude! it can take it!)or even Turbo charge it you would murder a lot of cars at the track.
i dont give a f..ck about the looks part,those older celicas were ugly,but they can be made very fast,alot faster than the current version without spending too much money.