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Stick with the 2.0mm MHG, you will only want the 3.0 if you've had some major machining done. I'm using a 2.0mm MHG in my 7m, no machining as the motor was basically brand new, and that lowered the compression to around 7.9:1 I think(this is according to HKS anyway) and that is borderling on too low.
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