I see where Jeremy of JET Motors has posted a video of himself unpacking an SC S-Pack which is the supercharged kit for an MPi engine.
https://www.facebook.com/jetmotorsmini/videos/672392503397509 (https://www.facebook.com/jetmotorsmini/videos/672392503397509)
Spendy....parts only is about $5600 plus shipping, I imagine Jeremy will charge a couple grand to install and tune it. But according to SC website it makes either 97 HP or 120, depending on cam - but I think the 120 requires a better cylinder head too.