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The only reason to use a 4 cylinder engine is emissions and/or cost. Mercedes had to use a 4 cyl in CLA because it's a FWD car designed for a transverse engine mount. I have no idea what you are going on about, the 4 cylinder might make similar power but it must pay the price for it's heavy reliance on boost. You can't cheat physics. The engine cannot be as responsive, period.
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