Yeah that site is full of annoying people. I just cruise it once a month or so and send new diesel owners over hear.
Yep a 7.3L Brabus V12 would fit in their without much trouble. I don't no the hp rating but I would think 600 or so without forced induction.
I would want that car with a sweet set of Brembo brakes and a 5sp manual.
Throw on a set of super sticky Dunlops and I would be about as happy as someone could be.
Ohh the Vipers that would fall prey to my old SEC!
I bet that car cost $100k. If you start off with a clean 560SEC figure at least $15k. I think the Brabus V12 alone would cost $40k. Then you have to basicly rebuild and improve every system on the car. The suspension would have to be tuned maybe some rare and pricy AMG parts. A brake kit alone would probably cost $4k, not to mention $15k for body and interior. A 5sp manual does exist because a few rare super cars use that Brabus 12 with a stick so a box is out their. I would figure on a custom driveshaft might as well use a light weight one $$$. Also a custom diff and half shafts to handle the massive power $$$.
But it would be a sweet one of a kind car and a new CL600 or CL55 would cost $30k-$50k more so it isn't a bad deal in a sense if you could do it for $100k.