The forth wave is continued from Stock Engine Mods article just next door. Here we are simply going to cut to the chase. For those of you arriving from the engine parts page jump, the smart money is to go up to Engine Commentary and read everything from there on down. No, study it. Get it inside. Then make a purchase decision.

You have a WRX. You want more street power. You do not want to risk engine damage.

After all the many pages of what not to do and why, explanations of octane and power we are here. And here is a very simple cookbook of tuning the WRX engine.

1) More power is ALWAYS a function of engine management control 

2) Engine management control modifications raises the power target of the engine.

3) Raising the power target necessitates the addition of some additional parts.

4) All this is done keeping a careful eye on the quality of gas being used.