There were no problems installing the kit. The mechanician who installed the kit is very skillful, he knows exactly what he is doing, he has worked for Toyota Rally Team before.
Only small prob was that the ECU in the new 2002 model has a bit different wiring than the old model (the TTE instructions were for the old model), but it was easily figured out.
The car feels now different (better! more powerful!), the sound of the engine is a bit different (rally-type, deep sound).