Everyone says that the standard ECU accompanying the C20XE is a "learning" ECU.
That is, if you drive the car hard, it will keep it more on an advanced timing map to suit the style of driving or something like that.
I noticed after my track session where I was redlining the car alot, my car came home with a highly responsive throttle response and much improved pull.
After a couple of months of mostly city driving in slow traffic, the car's beginning to feel lethargic again.
So is it the ECU or was it carbon build-up being blown away by the track session?