The GTD nozzle is the 253 number. I read some posts by Giles (i'm sure you have heard of him, the hot rod pump expert in Canada) and he recomended those over the other numbers. The extra power is probably from the better design. More effecient combustion will of course lead to more power, along with the intercooler. I would suspect the injection pump on the GTD engine has a different stock calibration that pushes more fuel compaired to the calabration of the regular TD pump. Another "injector expert" also confirmed this on the vwdiesel.net forum. I read through the listing of Bosch injector numbers and pretty much the DNOSD numbers just went up as the years went by, which further leads me to believe that they were just changing and improving the design. The Benz injectors may have a larger flow capacity, but the spray angle is wrong.
Jason
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