T31 4 bolt Exit - Turbine Housing for GT28RS / GT2871R/GT2876R / GTX28
T31 (T3) turbine housing with 4 bolt outlet. Fits turbine wheel found on GT28RS, GT2876R (GT25/40R) and all GT2871R turbos. Turbine housing A/R is Garrett T3 .63, or .82 A/R. Turbine flow rating of .63 A/R T31 is comparable to T25 flange .86 AR.