This should be very obvious but you need to hook up those coolant lines to your turbo. They do extend the life of your turbo and they are there for a reason. They are there to use, so you would be stupid not to use them, and why not use them is the question? And as far as some turbos only being oil-cooled, it is because they are designed to be only oil-cooled and they do not need to be water-cooled as well. If a turbo is oil-cooled only, it is because the CHRA is designed differently from a turbo that is water-cooled as well, it mainly has to due with what the CHRA cartridge is made of. Most BB Turbonetics turbos are oil-cooled only, because they have a CERAMIC BB center cartridge. Your stock T28 turbo is not this, and was made to run oil-cooled, and water-cooled and I would recommend running both. Unless you want your turbo to have a much shorter life span...

And I do agree with those that say running no BOV will kill a turbo. You would be stupid to not run a BOV when running a turbo, because a BOV serves a very important purpose for a turbocharged engine. It is there to release excess pressure in the intercooler track, so you will not have backpressure. Too much backpressure will kill a turbo, and by not running a BOV you will greatly increase the chances of having too much of it. Too much backpressure will be reversed right back into your turbo, and destroy turbo bearings. Run a BOV as well, in the end it will save you alot of headache and your turbo will love you alot more too.