[Mario_Marques]

Just 2 things in my mind to add to your conversation, egt, high exhaust piping temperature is good because it helps to expel gases out(hot, less dense, it's one reason why some cars use steinless steel in the exhaust, to keep the temperature high, also steinless steel it's relatively lighter than other material), but if the gases themself are coming out from the engine very, black and dense, it's bad, it means that some fuel is being wasted(not burned in the engine to build mechanic energy) hot it's bad, it may mean that your mixture is too rich(too much fuel burning in the exhaust), or your engine needs to be inspected(intake, dirt on egr, turbo not working good, air leak in intake pipes) or injection needs to be set properly(timing may not be good, dirty nozzles, etc).
Regards.