Hi
There are a few good DIY IMS write-ups on the Forum. If you want the nitty gritty on changing the IMSB you should probably read these. Search DIY IMS or DIY IMSB on the 996 Forum and you will find some like these;
https://rennlist.com/forums/996-foru...ll-thread.html
and this guy even DIY'd the IMS Solution which I didn't think you could do.
https://rennlist.com/forums/996-foru...on-thread.html
and some relevant info here in a thread I started while I was doing mine.
https://rennlist.com/forums/996-foru...questions.html