[Jack of all Trades]

..electronics geek.. ..huge market..

You rang? I think it would be simpler and cleaner to install something inline that would intercept the data and modify it as needed to keep it within reasonable limits. I also think that anyone who tried to sell such a thing would get jumped on by the Feds in a crack induced heartbeat. Aftermarket horsepower mods are sold with the understanding (wink wink) that the are for offroad (racetrack) use only. I can't think of a plausible excuse for installing a data defeat device.

[BushCountry]

These devices are not that smart, they only record like 48 different events (then recycle). They are only good for crash purposes (e.g. seatbelt?, hit brakes, speed, gas peddle position, etc...) as far a tracking a person they are useless. It is much easier to invade your privacy following your cellphone use, on-star system, etc...

One other point police do not, I repeat do not need a warrent to attack a tracking device to your car since you use public roadways (this is more scary).

[doodad]

I can't think of a plausible excuse for installing a data defeat device.

There are several PCM programmers on the market for several types of cars. Excuse? Well I can't pass emissions if the now nonexistant O2 sensors that the headers and y pipe eliminated are throwing code...so, I delete them via computer. I would be willing to bet you can already delete the date recovery function.