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instead of decreasing the compression i'd rather have a more precise tune and run premium gas. lower compression allows for more error while tuning. it also allows you to run higher boost levels on pump gas. if it is a stock h23 i wouldn't bother lowering the compression. if it's tuned well then you'll blow ringland before u have to worry about detenation. even if the motor is built all u would need to do is add more fuel and up the octane to resist detenation. most people i know that add thicker headgaskets do this on b-series because there bottom ends can handle more then the h-series can stock. you can drop in a thicker headgasket on a b-series and make 400whp on stock internals. try that on a h-series and you blow the ringlands aparts.
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The DARKSIDE awaits you!!
360 whp
409.9 ft-lbs of torque 
gotta love a turbo h23...
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