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Old 08-24-2019, 03:46 PM   #3
Scooby Newbie
Member#: 483821
Join Date: Mar 2018
2004 WRX 2.0 18g


I have been making 350 whp on stock internals (same engine as you) for over a year now with a slightly larger turbo than yours.

As long as you have enough fuel, correct ignition timing and remove heat where ever you can, this engine seems happy enough to make 400 crank hp without any issues.

Depending on where you live it would be best to sell the AP, change over to opensource tuning and get a pro tune on a dyno for your specific setup. Make sure to have all your mods done before you get tuned, and do your homework on the tuner.

Don't do full boost runs back to back, don't use much boost in 5th gear, only use boost over 3k RPM, and check oil levels every time you get gas and it should live a long time. You will spin a rod bearing long before you crack a ringland or bend a rod with these ej engines.

Of course do a compression test before you do any of this to make sure you are starting with a healthy engine.

The tune is everything!
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