Garrett Grup-N ball bearing 'drop in' replacement turbo upgrades for all RB26DETT series. These turbos together are rated at 600+hp flow rate, stock replacement. For the price, it can be considered the best bang for your RB26 bucks.
Turbos used are Garrett:836026-5005S
Garrett Turbocharger GT2860R; 62 Trim compressor; 0.64 A/R turbine.