Some advice needed

[Chadi]

I would like to purchase a few things for my 2006 350z (300hp V6, Enthusiast)

Which of these do you recommend, why and how much HP increase should I expect? I browsed so many stores, even official sites and seems like none show the HP increase info, but I'm aware there is some slight increase (my friend purchased the Injen model)

Cold Air Intake:- AEM- K&N- Injen

Short Throw Shifter:- what brand/model do you recommend?

Shift Knob:- I want a chrome racing style knob, where can I find one and what brand/model? I want the chrome ball style knob, I believe that is called racing style

Spark Plugs:- which do you recommend and what is the advantage over stock version?

Any popular online auto stores you recommend me staying away from?

Anything else you recommend for a little power increase without spending enormous amount of money? Between the cold air intake, spark plug, shift knob and possibly another addition I'd like to keep around $1,000 for now.

Car:Nissan 350z Enthusiast 2006, Stick (300hp V6) Hatchback

[RED_DET]

I would go with the Stillen CAI, Motordyne 5/16 plenum spacer for your first mods or skip the spacer and get the M-REV2. Those two should cost around 500-600 bones or a little more if you opt for M-REV. As far as short throw shifters go, I can't comment, not really a fan of short throw shifters. The G/Z have pretty short throws stock IMHO. As far as shift knobs go, I would recommend one of the NISMO knobs. I wouldn't mess with the spark plugs at this time, not going to gain much from changing them out, unless you go Forced Induction. Since you won't to spend 1k, I would look into a catback exhaust as well to go with the intake mods.