I haven't looked at the m84 with too much detail yet, but would it suffice, or doesn't it have the output capacity or configuration to run dual vvti?
If I was in the hunt for an ecu for my blacktop or 4agte, I'd definitely be looking at the m84.
My m48 continues to serve me very well after many hard kilometers.
Highly recommend MoTeC for it's superior quality and support.
The $ you have saved in purchasing the engine package, put towards an m800.