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twin turbo, the placement of the fuel injectors, just a totally different engine overall! i believe next year the sedans will be housing the new 335 engines. your only bet to getting more power would be either ecu upgrade or forced induction. the coupe itself can not be compared to the sedan simply because they are not the same, there was an article in a mag that said not one body panel is similar to the coupe so its not just the engine, its everything from suspension to materials
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