If Rainer recommends the 216s, then the originals are probably the 205s.
Replacing the injectors will give you a healthy and subtle performance boost, while also ensuring that the injectors have been refurbished.
Using it simultaneously with a conventional chip is not recommended, as too much fuel would be injected, which could damage the engine or cause excessive smoke.
Simultaneous use with specially designed software is possible.
I don't know if Rainer has something like that in his program, or if he could program it for you.
But if you inquire, please do so not in "time theft" mode, but only if there is a genuine interest

.