For your intake Racova, there are zero whp gains from the intake only changes in sound. Most intakes will only cost you hp due to their exposed cone filters which is called heat soak! Z-Tube is a good idea, changes the sound which most of us like! Most of the restriction in your exhaust system is in the OE cats, you'll understand once you see what they look like off the car! HFCs alone will give you that 14 whp. Headers only offer 3 to 5 hp on your VQ motors which isn't worth the cost to buy or install. If you need to drive to Vegas to get a Osiris tune it will be worth it, my gains were 25 whp and almost that much torque.
Gary

 

Hey Man, this site is the bomb! G35Driver is the best on the net. Anything you need to know is right here. There is alot of knowledge on here so if you can't find it in the forums just ask around and I'm sure you'll get the answer you are looking for. Enjoy that beautiful G!

 

Thanks for the advise, I love the G so far and want to do a good tune up on it before getting a dyno base. Than add stuff LOl. Looking at the NGK iridium plugs.