Whats a good site or company that make G35 Sedan mod parts like ecu upgrades. turbokits/superchargers ,intake ect u know the work ...i mean l need everything !!!!

Nikizmo.

l agree with the last answer. However, I'd like to add Stillen Performance to the list as well. They seem to have a love for modding Nissans and Infinitis. It sounds like you're going to make an already awesome car even better.

STILLEN make parts for infiniti/nissan, but turbos are gonna come from a manufacturer like HKS, GREDDY, GARRETT. Join a forum about your car and see what advice those people can have like what is good and what isnt. It will save you many headaches

If you want good products for Infiniti, go look for GReddy parts, but there is other brands that make them for the G, try APS,Power enterprise, SSR engineering, Jim Wolf technology, Turbonetics, Garrett twin bearing.