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I have some thoughts and questions about upping the Compression Ratio of an EJ25 block from the stock 9.7:1 to something in the range of 12.1:1
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Your car is 10:1, not 9.7:1.
This has been discussed over and over. The cost to get 250hp out of your car NA is going to far exceed the cost of a turbo package to get 250hp. With a bolt on turbo kit, the only real cost is the kit itself, but with higher compression NA motors you have to rebuild the whole motor, get the heads worked, new cams, etc. 280hp is really optimistic unless you seriously raise the redline.
Sure, it'd be cool, but it is very expensive and much more limited in power output.