A camouflaged Lexus IS prototype with emissions testing equipment and manufacturer plates was spotted in the Colorado Rocky Mountains by The Fast Lane Car:
As suggested by TFLCar, a plausible possibility for this IS prototype is the testing of the 2.0L turbo engine first introduced with the NX 200t.
Lexus has already trademarked IS 200t in various markets around the world, and the 2.0L turbo the best candidate to replace the aging 2.5L V6 currently found in the IS 250.
[Source: TFLCar]
