Some of the standards upgrade which will help is getting a better ECU. Depending on how much money you wan to put into the car, eventually you may want to get better cam shafts, a wider muffler to deal with the increased airflow, and new fuel injectors to start. There's many forums you can check or simply go on youtube, look for other people who have modded them and see if you like any of their mods and copy them.
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What is the best performance upgrades for a toyota celica?
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