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I would like to give you some information about our latest VTG upgrade for 991TT/S.
We use our proprietary 68mm compressor wheel inside the OEM factory housing.
Regarding the turbine side, we also offer optional clipping service which will result with very small lag but will have %5 more flow through the turbine wheel.
One of our customers made 55 whp more with -2 psi less boost compared to stock turbos.