I have a pair of Mefi II ecm"s from my 500 EFI's part # 16237009
Rev limiter set to 5400 RPM other performance mods done by Precision Marine.
make offer for the pair
Believe it or not the 5200 sofens and dissolves it takes time I soaked them with paint thinner and peeled them loose a couple days later, Ican post some pics if needed