I am just wondering a little about the engine character in my 155. I thought it would be a revvy little devil that will spin upp to 7000rpm very happily and give more power the higher the revs... Somehow this is not the case. Compared to a Peug Mi16 I used to own once, the Peug was litterally dead below 3000rpm and after 4000rpm it bursted to a powerful engine and pulled all the way up to the redline. In the 155, the car has good power around 3-4000rpm but in a way it feels silly to rev it up to more than 5000rpm... That is where I feel that power developement stops and going on to 7000rpm does not make any bigger difference.... Is this normal or do I need to check my S-plugs, Airflow meter, or any other ideas? I replaced the airfilter to a green cotton open filter but there was no significiant difference on the higher revs.