Cam gears for sure, tuners that don't touch em are I lazy to pull the cover and adjust em. I no my tuner would pull the covers off and change em, because he no's he will get a better result by doing it. I've got a FPR on my car, rail pressure bumped up alil bit, and I make 312 kw easy, factory afms, and injectors. Don't listen to all this bullshit about changing injectors now, it won't make any diffrence.
If u are going for more power, than change the injectors, your Gunna have to get it retuned to make the more power anyway, don't waste ya money.
Get it tuned as it is. Put some cam gears on and be done with it. It will take u a lil while to get over the 300kw