👍 Reliability: These turbos are Original Garrett. Far easier to tune, retains all of Garrett's R&D and reliability goodness compared to a hybrid with oversize compressor. We're big fans of OEM++
👍 Efficiency: With less heat you can throttle longer. Newer 3rd Gen VNT technology is far more efficient than older 1st Gen GT turbos due to improved vein geometry (less heat and exhaust pressure).
👍 Performance:Rather than squeezing power with a big wheel in a smaller frame GT turbo, these units are built for power. From the 180PS 2.7 and 233PS 3.0 V6 TDI, no special formula needed. These are beasts out of the box on the 1.9 & 2.0 TDI engines.
👎 Extra fitting: What goes in must come out. Letting all the extra exhaust out requires a larger turbo outlet, so at the least you'll need to change the connection to the exhaust (flange), but probably better upgrade the whole thing.
👎 Supporting mods: To get the most out of these you definitely want an intercooler upgrade and have everything else in good condition. Although these engines can handle a lot, it's worth giving the camshaft lobes and lifters an inspection no matter age or mileage.
👎 Journal bearing: Dear Heavenly... uh... Spirit. Thank you for providing us with the direct-port nitrous... uh... injection, four-core intercoolers, an' ball-bearing turbos, and... um... titanium valve springs (-Jesse). Oh wait, these are journal bearing. They just have a bit less transient response than a ball bearing turbo. Those are over here by the way -> Race Turbos