All of this stuff is based on what your goal is!
If you want more performance than what the Cobra intake can offer then you step up to the Performer.
If you want more performance than what the Performer can offer then you step up to the RPM.
And so on!
You are dealing with the age old problem of ....................
As you make more power or get quicker, the gains become smaller even though the cost is larger.
If you have a fixed goal in mind then you know not to waste money, time, or effort on lesser performing combo parts.
I do understand what you are saying and that is why I did the things that gave the most gain for the buck spent first.
Take a look at my sig and you'll see I did just that.
Later
Grady