Guess the point is the least acceptable where an engine has enough to start to be considered a performance engine at street rpms 2500-4500, that's why I'm ask torque this is where torque generally gonna peaks on a street engine, you got slow then peppy then performance then many levels of performance.
Trust me, it's a disease. You'll always want more... but take my advice... There will always be someone faster, so be happy with what you have. It will get expensive...quick