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On a 2.6? I'd say you'd be spending an aweful lot on the head to make it anywhere close to streetable. What sort of power are you after? Those turbos are mainly for drag focused cars rather than anything else.

Laggy turbo for RB2570cc engine . AFAIK the KAI's have the 94mm OD compressor where the SPL's have the 102mm one .

Just a little background info on the Garret T51 based turbos . The name T51 comes from the older tech T series turbine they use in 76 trim . Garrett use the "R" prefix to differentiate ball bearing from plain bearing units .

These units use the large frame GT type center bearing housing but as in with the T04Z from memory they machine the turbine housing mounting ears of the back of the bearing housing so that they use the older T series crab plate style fastening system .

Garrett's GT4294/R and GT4202R/R cartridges are very similar except they use a more modern GT42 turbine which is unfortunately in 84 trim . I seem to remember the HKS T51 versions having at times slightly smaller compressor wheel trims but I don't remember the details , not interesting to me personally .

For an RB26 that's often street driven if you want a more practical HKS turbo then have a look at their T04Z , still not exactly small but at least you'd get same day turbo response .

A .

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