Way to unlock power restricted from emission standards?

[Brent]

I was debating to put this under the Engine mods, but I’ll just put this here….

Quick background; I have a 1997 Toyota Corolla, I have done alot of research on this vehicle because to try to squeeze as much power out of it as possible. In my research I have found that in Russia (which has the least amount of emission standards) my car makes 125hp. In Japan it makes 115hp. In the united states it makes 100-105hp.
So after all that…. my question, Would it be possible to ‘unlock’ this 25hp that was removed due to different emission standards in different countries?
Can I buy a new exhaust and cat? New intake? I have a SRI on it already with a huge (and unnecessary) cone filter.
My exhaust currently is leaking like crazy and rusted. So I have a ‘performance’ one in the mail (.25” bigger in diameter) it was the only complete muffler system I can find that isn’t super expensive, and a new cat that is a Walker (because mine rusted through).

Oh and btw I have the 1.6L 4A-FE if it matters.

Topic

[David]

Before you start trying to boost performance of the engine, I’d strongly recommend making sure it’s in good shape mechanically (do a compression test as a minimum). Next – make sure your goals are realistic – it’s a 20 year old economy car. Depending on the condition of things like your ignition system (plugs, wires, coil, etc.) you could see a noticeable improvement in performance and fuel economy by refreshing that. The fuel system could also potentially use some help (fuel filter, fuel pump, etc.). Have you pulled the injectors to see what sort of condition they are in? are they badly fouled? How about the intake/exhaust valves? there are lots of places to look for improved performance.

the difference in power could be due to all sorts of things – cams, valves, engine management (ECU/tune), etc. – there is probably not a whole lot to gain in terms of the engine. Once you have the car sorted out, I’d focus on handling and stopping – better springs/struts, wheels/tires, brake pads/rotors/lines, etc. will probably have a more significant impact on how the car feels.

[Author]

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