Problem is with getting anyone to make something TTA specific.
1555 cars made, maybe 1000 or so left, of those how many actually are modifying their cars, and then of those, how many don't already have a DP.
Not too many vendors will want to spend the developement cost when they may only sell 5-10 of them.
The advantage of the DP deal I'm trying to work is Buster already developed/designed the TH TTA DP 6-7 years ago, so the only cost for him to make more is actual production cost.
