I would be careful swapping between different tune platforms ,at my shop I have seen where people swapped tune platforms and because of files are left from the previous weird issues started to arise ,car would run great one moment then run like crap the next and after a lot of frustration the problem was the pcms had file left over in it that could not be erased we have since seen this issue 3 more times ,,now my understanding is that hptuner is not married to our pcm so changing to diablo may not be a problem but im not sure if that's true,i would get a replacement pcm that hasnt been tuned