It sound like the person just removed the exhaust before the catalytic converter. That V12 sounds like a milk truck with a bad muffler. In other words, it sound like crap. I don't think I'll be doing that to my CL600.
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not exactly something to increase torque, horsepower was probably increased a bit.
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If you increase hp at any specific RPM, you are increasing tq at that rpm. HP = torque * RPM / 5252
You probably meant to say that he is losing low end torque but increasing hign end hp. However, I'd bet the stock exhaust manifold is restrictive enough not to negatively effect the exhaust velocity by removing the cats and mufflers. He should gain hp and tq in every part of the rpm range.