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An ECU reflash + turbo back (downpipe + high flow cat + cat back) + intake should put this car in the IS350 ball park. I am a '15 IS350 owner, and based on my previous factory turbo vehicles and mods, I believe an IS200t with full turbo bolt ons would be able to keep up with a stock IS350. The gap between the IS200t and 350 is only ~65hp, the difference between an IS350 and an ISF is ~114. Also, the ISF has an LSD to put the power down to the ground.
I believe an IS200t with full mods will keep up with a stock IS350.
We will see soon enough.
The IS350 F Sport is more than just an engine upgrade, you also get the ML sound system, sport suspension and steering. Even if the IS200t could keep up with the 350 after mods, I still would buy a 350 every single time.
Too much work just to assume you can archive the stock power of the 350 and save couple grands is my point of view.
My 350 didnt come with ML, that's an option when purchasing the vehicle.
When you say engineer do you mean on of their service guys? I doubt an actual engineer for Toyota/Lexus would be at a dealership.
No it was not a service guy from the dealer, it was a guy from the company lexus that help make the engine. He was called to come to dealer to check on some is200t'S including mine that they didn't know what was going on with my engine.