Hey I didn't notice this message, I dont normally get visitor messages rather private messages. I don't know anything about the 2.5 engine but things that could cause a lag once warmed up can be anything from Knock sensor, injectors, and possibly coils. Have you ohmed out the injectors to see if you're getting 10-14 ohms?

Your engine coolant temperature sensor can also be bad. do you have a check engine light?