here in corpus, lots of diesel guys do that. there is nothing ever done about it. they get special tunes for drag racing at night to make money off the import cars who think their little hondas and acuras are fast.
i have a few friends here putting out just under 2k pounds of torque and some crazy hp like 1100 or something. they all blew up their stock trans and driveshafts within a month of doing their tunez and some went with sun trans and some with others. all i know is they are fast