My two cents worth on the Ti valve thing just to see if we are all talking about the same stuff. Any benefits that come from Ti valves are not directly related to their reciprocating mass. The gains come from being able to use the lighter valve springs. The springs exert considerable force on the camshaft. In extreme cases it is possible for them to actually rotate the crankshaft. So, each power stroke of the engine must over come this force. Stronger springs take my force to compress so that will mean less horse power to the rear wheel. This effect would be noticable at any rpm. This would rob you of HP and you can compare it to dragging the rear brake. How much differenct does it make. Well, I am sure that if you are going for you PhD in automotive science that would make a great reasearch project. Since this is an engine of good quality we can safely assume that some work has been done to eliminate friction in other areas which may allow our Ti valve to have a more noticable effect. If it gives you a half to one HP that may be more power than the guy next to you so every little bit helps.