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i believe hydrazine modified the lower plenum and offered it for sale, and then he further modified it for more gains, hence the ++, which should be available for sale soon.
I've been reading the thread on the Mrev++...I think the difference is that the Mrev++ is another variation of the 287 lower plenum that is machined...and not just a polished version...would it be better to wait for the Mrev++ or just go with the Mrev+ ?
The MREV mods (both the + and the ++) have shown gains on both the 287 and 300hp engines.
The benefit of having the 287hp motor is you can do a core exchange and get a pretty good price off the entire deal. 300hp owners have to pay full price.
You will get more gains from the Mrev++ comparedto MREV+ due the additional machining, but soon I dont think you will have a choice anyways. I think Tony plans on only selling the MREV ++ and dropping other versions. MREV++ works on both engines, but it will be cheaper for the 287 engine guys due to the core exchange.