I'm surprised you couldn't tell if the Dinan stg2 was gone???
My car was re-flashed to stock after HPFP replacement recently at my local dealer. I told them I had Dinan stg2 and they told me the flash would erase it. Since they weren't an authorized Dinan dealer I just took my car to my Dinan auth'd dealer and they flashed the Dinan stg2 right back on.
For the day I was driving the stock tune I could tell a huge difference in power though. Hard to not notice.