2009 370z tuning question

stl370z

hey guys i need help here,
i am about to by TOP SPEED PRO-1 Full Exhaust System for about a $1000. and thats for ( Released Resonator Silencer Design 2.75" (69mm) Exhaust Piping T304 Stainless Performance Stage 1 Package Y-Pipe + Test Pipes + Resonator Catback Exhaust with TIG Welding with 4" (102mm) Tip + Mandrel Bend Piping ) and Injen Dual Cold Air Intake System for about $500.
and i am thinking about getting the car tuned, is this good enugh upgrades for me to tune the car, because i have people telling me upgrade the fuel injectors then get the tune and i should get more power, is that true and wat kind of power should i see just from the exhast and intake, and if upgrading the fuel injectors will help to get more power from the tune what kind of power you think i can get with all the upgrades, if you have a better idea for the exhaust for a bout the same praice plz let me know thanx guys

__________________
SPEED,SPEED,SPEED