I am very new to the whole world of moding cars and am unsure what to do to increase power. I have a 1994 jap import celica gt. It's has a hks mushroom kit, straight through exhaust system, upgraded ht leads and upgraded sparkplugs. What else can I do to get the most performance out of my little beauty as it's quick, but it could be quicker. All suggestions welcome.

Thanks in advance

This may be a personal opinion, but I believe that it was lagos that posted a link to a test between different air filter types. Based on the results I would recommend swapping that intake for an AEM dry-flow filter intake. You mentioned that the car had a straight through exhaust system, but does it have an aftermarket header? What size is the exhaust piping? Have you replaced distributor cap or rotor? Typically the key to success with this type of thing is to always have the car properly maintained. Aside from that you would likely need to consider the use of a turbocharger to increase power, or perhaps a motor swap. Hope this helps.

Well depending on how much u are trying to spend i`d say force induction, or Spraying the hell outta it(NO2).
For the no2 u`ll just need a 50-75 shot kit and a bigger fuel pump so u dont run lean.

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So what exactly is a forced induction?

Lol go to the forced induction section on this forum that may give you a hint, but it's pretty much turbo, supercharger

First off, i would suggest you figure out how much power you want out of your car then go from there. If you want a little power and some bling, go with mods like: Air intake, Header, Custom dp, Cat-back, Camshafts, Clutch, Flywheel, Remove/Bypass A/C.
If you want as the say... "MOAR" power, i would suggest these: Motor swap, Turbo, Supercharger.
Good Luck and have fun!