even file tune depot isn't sharing modified .tun files anymore...

from thier home page:

"Many of you may be aware of the increased attention that vehicle tuning is receiving from the Environmental Protection Agency (EPA) and California Air Resources Board (CARB).
While it is still legal to tune your vehicle for off-road or race use, it is not legal to do so for road registered vehicles in most US states. The modified tuning section on Tune File Depot has never been very active (only 34 tunes submitted in some 6 years of operation) so we have chosen to remove this section from the Tune File Depot website effective immediately.
It is not clear from these organisations who they consider responsible or accountable for any improper usage. In the recent weeks and months there have been some very large and high profile organisations which have made the bold move of discontinuing sales and distribution of very successful products due to this heightened attention. While Tune File Depot has not produced any of the modified tunes we simply are not prepared to risk being of interest to these agencies. We apologise for any inconvenience this may cause our users, but hope that you understand."