Ok here you go then
can I get bigger injectors? Yes. 5.0 Mustang injectors will work...you can order em from Steeda or wherever. Make sure you get a MAF/Tune for the new ones tho.
can I get a stand alone computer? Yes, you can use an SDS EM-4, for example...that's what I use. For the SDS system, you can Pm a guy called Racin' Ranger on rangerpowersports.com
why did one member put the turbo all the way at the back of the car?No need to worry about fitting a turbo under the hood that way plus no need for turbo headers.
can I get headers for a twin turbo setup? Sure, but you'll have to call around and find someone to make them custom for you. I think there was a guy called Kraven or something like that who was talking about making TT headers/kits for the 4.0. Find him on rangerpowersports.com
is the maf a big problem? No. Just get a bigger one. I used to run a Pro-M 80mm before I went to a stand alone. Now I have MAP so I no longer need a MAF. I got my 80mm maf from Dan at Accelerated Race Technology. his website is
www.speedfreak.cc. Nice guy and he knows a lot, call him up.
Is heat going to be a problem? Depends on what you mean. If you mean the heated air charge from the turbo....as long as you intercool or use water injection, no. If you mean the heat coming off of the turbo itself....a rear mount turbo would make sure it doesn't get too hot. Or look for a guy named Omar Figaroa (sp?) on rangerpowersports.com. He fabricated his own turbo setup and it's under his hood....ask him.
can I get a better feul delivery system? You can go as crazy as a fuel cell with an Aeromotive A-1000 pump and big stainless steel braided lines if you want (i.e. a guy named 8secsplash on rangerpowersports.com), but you probably don't have to do that. A 190lph mustang pump in your tank combined with a Vortech T-Rex 155lph inline fuel pump will give you all the fuel delivery you need.
I'll probably get in trouble for saying this, but, this is a great site and a I love it, but very few people on here are still seriously modifying the 4.0 OHV motor. With that said, there are a lot of guys on rangerpowersports who are doing the things to the 4.0 OHV that you are interested in, and the info stays fairly current. Again, not knocking this site at all because it's great but the info you're looking for probably isn't on here in great detail.