Mappings of turbo engines that improve both performance and fuel efficiency or just performance while fuel efficiency remains unaffected are pretty common on tuner's market but there's a common belief they all introduce excessive wear and tear of components.That makes sense. The same tuner has a flash available that they claim makes the Lexus 2.0T much, much more powerful, although they don't talk about MPG with it. Interestingly, their Tacoma flash does improve both power and MPG, suggesting Toyota screwed up.
Lexus LS powertrain in IS-F does make sense especially with some sort of performance tune but with what exactly do they replace current V6? That rumored 2.4 turbo I4? What is that good for? 300hp/300ft-lb? Such a weird displacement and number of cylinders to go after usual suspects with 3.0 Twin Turbo V6s.