You might want to look over on the FB Group called "Massey Ferguson 4700 Global Tractors" I've seen posts over there about tuning their engines, and what they used. There are some dealers that comment on there too, but I don't think they talk about tuning engines. Mostly they offer advice on Codes and issues with the tractor that come up. I posted a Code on there about my 4707, and my dealer called my phone to talk about it. How awesome is that?