OP, a fully modded 550i makes at the crank about what an M5 makes at the wheels...and the M5's drivetrain is much, much better. The handling difference might be smaller, but it will exist...and the M5 will feel connected and alive through all of it...a 550i just won't ever quite get that. And that's a stock car. With any mods at all, an M5 will really be out of reach in any way.
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