I have no Idea, I don't have one, never spoken to them.
I'm just sticking up for JUBU a bit, as I can't see a reason they'd choose to limit power increases as they do, without very good reason. They simply must have seen issues when exceeding the figures they'll go to on stock motors, otherwise they'd be flogging 1000hp motors for 50 bucks too.
I come from the world of powerboat racing. In that world, I have lost count of the number of folk that turn up with 'tuned' motors, usually from the car/drag scene, gobbing off about big hp numbers, and 20 mins into a race, they have a bilge full of scrap engine parts, as flat-out boat racing will find the slightest chink in the armour of a supposed strong motor. I think severe track use is similarly testing, not quite as tough, but similar. With fast road use, you can probably get away with murder, as it's near impossible to rag a motor on the street, with the kind of duty cycle seen on track.
Just my 2c
By the way, JUBU say, everything is fine with the stock V6 motor, until you exceed 500nm (370ft-lbs) of torque, that's when you'll start to see piston issues when pushed hard on track. This is why they 'reduce' boost on their 460, purely to keep it at 500nm.
I wish you the very best of luck with the Emira tune.