Local customers report almost no change in fuel consumption but increased in power.
Those abroad, i.e., USA, has data in his fuel consumption which I find to be quite impressive.
Mazda 6 Sport MT (Mazda 6) | Fuelly
Regarding warranty, mine was connected to their laptop and the technician didn't see a thing.
I have the Dyno results, if ever you're curious.
In terms of fuel consumption, I am able to reach 25 km/L. Prior to OVT, I can only get a maximum of 23 km/L. I might have a slight advantage in terms of weight since the Mazda 6 is lighter than the CX-5.
Cons? You are limited with the safety. OVT won't push their tuned cars beyond what is safe to operate. In other words, you won't get the maximum power output if you'll be shortening the life of your car. If I'm not mistaken, there wasn't any report for engine breakdown as far as OVT is concerned.
OVT is known abroad, particularly in the US.
Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
at 1M... the CHAdeMO plug alone make it difficult for me to consider this car... tapos we all know...
2021 Nissan Leaf