Easy.. Use the MAS EXPLORER. Extract original teamtext for a folder. Copy the 3 DRS files in that car folder for the folder u create. Create again on teamtext.MAS with that files and put in the car you want.
Use that exemple to create a DRS wing for your car, and create a texttext.mas, like i say in previous post something
"BPRcarnumbertext.MAS" and is ok
If u don´t understand tell want car you will use, and send me the files i can create a e.g.