a stock lotus ECU is the same as ours. WTF is wrong with people
Um, sorry to dissapoint you, but the Lotus and the Celica do not use the same ECU acording the the Elise owners who have checked it out, Lotus uses their own ECU with the 2ZZ, and the wiring harneses aren't the same (so, they can't be interchanged without a harness)
Lotus definitley retuned for their car, the flat spot just before lift has been fixed, by slightly lowering lift engagement and adjusting the cam phasing. Apparently they also showed toyota what they did, so this tuning will probably be used on future 2ZZ applications.
However, aside from this, most of the actual gains came from the exhaust, and some tuning to the ECU to optimize it. You can do the same with an exhaust, Intake
and Power FC, you'll probably see better gains.
The ONE advantage to using a Lotus ECU may just be hinged upon wether or not it's more receptive to reprogramming than the Toyota ECU. However, nobody has dug that deep into it yet. Upgrading may be as easy as plugging in a tuner module or a new chip.