80 Series Turbo Fitter

How much did it cost Ian?

Dodgy

I would love to know why no oil cooled turbo,why no bigger exhaust, and why no intercooler?

There is no need for water cooled turbo on a diesel, all you are doing is putting more load on your cooling system for no reason .
I would'nt and don't fit turbo kits without a bigger exhaust it make all the difference and reduces turbo temp.
Intercoolers, it depends on boost pressures anything under12psi you don't need one.

Bottom line...diesels dont need water cooled turbos, but Toyota use them anyway....thesame load on cooling system either way, as there is a oil cooler in the block surrounded by coolant, and the oil takes the heat away from the turbo if not water cooled....Do get a new muffler, straight through, as it will be quiet....from the turbo to that muffler, as big as you can....3 inch is good, 3.5 better....turbos work on the difference of pressure, and if there is back pressure in the exhaust, there is less boost....for that amount of injected fuel....if you intercool, you are taking thermal load out of the combustion zone, supplying the motor with 60 deg charge instead of 110 degree, which means lower egt's. longer lasting motor....problems surface when you try to boost up too much....
My advice, stick to reputable brands, and if you want power, change direction and start looking for a factory turbo motor to fit...goes straight in, GRUNT galore...and your motor is worth x $$ to sell...
Andrew