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This little 4 cyl reminds me of the days I used to play with mitsubishi cars.. I do remember running up to 40psi on a very very large turbo and making close to 600awhp without the beauty of methanol injection or e85. As long as the engine block can handle it.. more boost is more power. Of course the other limiting factor would be how much air the stock turbo can actually push. If billnchristy saw the 330i tunes going up, I have zero doubt the m35i would handle more. The compression is different as well as the turbo is a little bigger for us. There will always be a lot more on tap since the margin of error and overbuilding things is common. Although with the mercedes amg 4 cyl I think they have pushed it really far.
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