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Originally Posted by gtaste
Old tech? Individual Throttle butterfly, 8k redline.. The history of this S54 block is long and evolutionary. Tolerance is low so handbuilt is required which costs more (17k for the engine). This is not an engine for bread and butter models. Drive it and you will know. It takes some concentration to drive it smoothly.. I have to take a deep breath everytime it gets fire up before driving off. It 's not about engine displacement and hp it generates.. It's all about how it delivers the power. Most will hate S54 block in a family sedan. Trust me I have one and loving it. It's highly strung and feels brutal. But that's the trade off. I drove the e90 330i, it's smooth.. so smooth that I love it as well.. performance asides, it's still different...
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Well this is a bit exagerated. The M3 has great engine. It could be detuned by 10% for smoothness (possibly) and still get 300HP. Anyway, it could be have been a 3.5L version of current 3.0L. 255 x 3.5/3 ---> near 300.