Renntech or Brabus bullet

Thinking about turning the c63 over to Renntech or Brabos for the Bullet. The Renntech sound like more power. I would like to get it down to 10 flat at 140 mph instead of the 11.5 of
the Bullet. An the top speed in the 230 250 range without going whole hog for the twin turbo 12 cylinder....but 867 hoirsepower and 1007 ft lbs of torque dialed back to something over 800 ft lbs sound great and super expensive. Anyone done this? How did it turn out for 11,000.00? or over 100 for the twin turbo 12 cylinder? How about the radar laser anti radar anti laser in the mirror??

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