Honestly that car was a freak to go 14.3 with nothing else but an intake. Now what has happened is that when you tuned it you pretty much made it just like every other GP, and without a custom tune youre running what you pretty much should be running. 1 degree of timing can be worth 5hp, so that 2 to 4.5 degrees is where you are losing power. But in the end you are right where you should be. Maybe .2 tenths quicker if you can richen it up to get rid of that KR. What are your narrowband 02 values in that pull? Ive seen it too many times where people have factory freaks and think that they should still run faster than everyone elses after modding. 1+2 does not equal 3 in modding.
