I did a compression test on my engine, and its really low on compression in 1 cylinder, and a little bit in the 2nd.

Was just curious as to what might be the cause of it being down compression. And ive been told that its a rebuild for it. I would of thought it would just be change the cylinder heads over etc, not a whole rebuild?

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MY02 WRX STI

Full Cosworth Internal Rebuild, Autronics tune, Cold Air Intake, 740cc Injectors, 3" TBE, 600hp Fuel Pump