I heard the upgraded one is good for max 300whp, was thinking of getting that, so I guess not worth it ? I am rebuilding my motor with stronger internals because my piston ring when bad. and going to wait till I save up for a new clutch and bigger turbo ( Most likely pure turbo stage 2 )
There's a big difference between the upgraded one that 845 sells. Which is just a GTX 11 + 0 turbo core. It just has higher flow running through it.
If you're trying to maximize your turbo output you're going to want to get the stuffed turbo from KDM tuners. The stuffed turbo has a honed out larger compressor housing as well as a larger inducer and exducer.
If you're trying to spend big money though I recommend you buy the big turbo setup.
Most likely I am going to go with scuffed turbo stage 2 to make 380whp and that should be more than fast enough, ( any more power, and I risk breaking axles or something, and if I can beat a scat pack or 5.0 and will be happy.) I would love to go big turbo but its just to expensive, and I am not planning to make more than 380whp