Hello, my 2010 RRS was overheated due to water pump failure. Dealer changed water pump and some houses. Car feels different now. During a start it is very loud, runs a bit louder than used to be ( My friend has 2011 LR4 with 60k and it is quieter). Also feels last a bit less power. Dealer checked and did not fined anything. gas milage is the same. Coolant and oil consumption is normal. What could be wrong? What should I look for, I have another 2K warranty and would like to see if anything needs to be done to do it now.