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Actually CR doesn't really make more HP. I did a 10.5CR test in my STI and it made almost no difference in HP on the dyno. It ends up being a trade off as you have to reduce timing to making up for the higher CR. Where it helped was off boost, which was very snappy! Actually that picture is from my engine with the 10.5CR pistons and then a boost hose coming off the WG.
For these new engines, the Direct Injection will really help with controlling knock and I think that we can get decent safe power without having to tear into the motor. But who knows!
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