No. And, most likely, the other two changes you made probably didn't gain you anything either.
The basic, stock L6 engine is very well designed and that includes all the ancillary components. You have to upgrade the internals (cam, head porting, pistons, etc.) to really see benefits from headers, intake, TB, and AFM.
I know that's not what you wanted to hear, but at least the changes you made haven't hurt anything. You'll gain more horsepower from a proper tune up (including valve adjsutment), and making sure there are no vacume leaks, all the FI sensors are working, and there are no electrical problems.