Has anyone turbo charged the 4.3V6 yet?, if so what turbo(s) do you recommend?

ALso if the 4.3 is EFI, wheres the injectors or the EFI rail ?!

any info would be greatly appreciated

 

Do a little searching around. There is at least one person here who has turbo'd (rear mount) a newer 2nd gen.

The 4.3L injection system is called SCFI for sequential central fuel injection. It is true multi-port fuel injection that only fires each injector when the cylinder requires fuel, but the injectors themselves are housed together in a main injector housing called the spider body. From there, the 6 electronic injectors feed fuel through nylon injector line to 6 pressure actuated poppet nozzles that are located down in the intake runner. All of this is under the upper intake plenum. The fuel lines & maxi injector connector are just behind the throttle body.

In '02, GM upgraded the fuel system to remove the somewhat problematic poppet nozzles into what they called the MFI spider. They moved the injectors out to the end of the nylon lines to get rid of the poppets that would like to gum up if not properly maintained. For people that are putting power adders onto these motors, this wasn't seen as an upgrade as the MFI spider could not flow as much fuel as the SCFI spider. For those people, there was the marine intake which used 6 individual bosch style injectors with fuel rails and had an aluminum upper plenum to better handle boost pressures.

You can use some of the terms above to find more information. Things like "marine+intake", "MFI+flow+rate", "MFI+upgrade", "rear+mount+turbo", etc should get you more than enough reading material to keep you busy for a bit.