My two bits :
1,3,5,7,8 should help.
2,4,6 no advantage.

7 for sure !
I have read studies stating the a CAI is a waste of money, others stating that a small performance gain is possible due to the lower IAT's.

exhaust mods have not shown any real ROI, intake mods do seem to add some torque and HP.
As far as the fuel flow, it is completely adequate on an NA, it's when you get into the higher boost numbers on the SRT6's that you need to look at fuel flow ( Air Fuel Ratios )

The VERY BEST performance mod on an NA is to drop in a V8, but this requires some expertise on the electronics.